Muktol

+1
A card that works very good with "Quest for the Goblin Lord" would be "Mogg War Marshal", tough it might just be a little bit to slow here.
"Massive Raid" can be a very interesting card if you just cant get through your opponents defence.
"Legion Loyalist" provides you with trample and first strike for your goblin hordes.
"Searing Blood" could be removed for "Searing Blaze".

Personally I would trade 4 "Frenzied Goblin" for "Legion Loyalist", 2 "Lavastep Raider" for 2 additional "Raging Goblin". Sideboard "Pyroclasm" and "Smash to Smithereens" for e.g. "Massive Raid", "Goblin Grenade" or "Foundry Street Denizen".

Greetings
Muktol

I would use another enabler instead of "Memnite". "Invisible Stalker", "Tormented Soul", "Sage Owl" or "Faerie Impostor" are solid, modern legal, choices.
On the spell-side I'm personally using "Artful Dodge" and "Ghostform" to give my creatures unblockable. "Familiar's Ruse" gives you a little bit more control while it also allows you to play your ninjas again.
"Ronin Warclub" can help to boost you creatures damage a little bit.

Greetings
Muktol

"Great Furnance" is another good card to boost "Cranial Plating", as well as "Ancient Den". Only drawback is that they aren't modern legal and would be the only cards in this deck that would ruin your legality.
As they are only emergency cards "Mirran Crusader" and "Etched Champion" provide something that helps them to survive: Protection. The champion has the big advantage of having protection from all colours thus being unblockable by anything other than artifacts and unremovable by anything other than mass-exile, mass -x/-x or forcing you to sacrifice it. Only drawback is that you cant use "Assault Strobe" or "Magnetic Theft" on it.
"Steelshaper's Gift " may be something for the sideboard when you are forced to board a certain card to survive against an opponent and know that you will need in on the table very fast.

I would include a plan B if you Gaveleer gets removed. Personally I would splash white to get access to "Kor Duelist", "Mirran Crusader" or any other good, hard hitting, creature, best with some sort of protection/ evasion. "Etched Champion" could also be an option for this. Splashing would also give you access to things like "Dispatch" and "Steelshaper's Gift", furthermore some protective spells.

Some further suggestions:
Galvanic Blast; {R}; Instant; Deals 2 damage to target creature/ player, when metalcraft is active it deals 4 damage instead
Cranial Plating; {2}; Equipment; Equip {1}; Equipped creature gets +1/+0 for each artefact you control
Swiftfoot Boots; {2}; Equipment; {Equip {1}; Equipped creature has hexproof and haste
Darksteel Citadel; Artifact Land; Increases the artefact count for Cranial Plating

Greetings
Muktol

Each decks should include a deck- and how to play description. The deck description should involve things as the basic idea why you did build this deck, if there's any story behind it, budget, certain cardchoices, especially if they deviate from common lists, legality, or any other information you can give others that will look at your deck. Best do this while you are building the deck because after some days important information's simply may not be remembered.
The how to play description is crucial for beginners. An experienced or expert builder can normally take a look at your deck and see how it should work, but there also are a lot of beginners out there that maybe want to take a look at this and compare it with their own ideas/ decks. Even for more or less standard-decks there should be a description just because of this.
By using deck-tags you can avoid to put unnecessary information into the deck name and thus making it too long. The tags also allows you to filter the decks you have made for a certain type, very useful if the number of decks you've build here steadily grows and grows.

As for the deck, the first thing that came into my mind when thinking about zombies and devotion was "Geralf's Messenger". Triple {B}, hard to remove (undying) and deals damage when he enters the battlefield. "Skinrender" could be another option if you need more removal, while "Death Baron"/ "Cemetery Reaper"/ "Lord of the Undead" would boost your zombies.

Greetings
Moktol

The deck description could be a little more detailed. It can involve things as the basic idea why you did build this deck, if there's any story behind it, budget, certain cardchoices, especially if they deviate from common lists, legality, or any other information you can give others that will look at your deck. Best do this while you are building the deck because after some days important information's simply may not be remembered.
The how to play description is crucial for beginners. An experienced or expert builder can normally take a look at your deck and see how it should work, but there also are a lot of beginners out there that maybe want to take a look at this and compare it with their own ideas/ decks. Even for more or less standard-decks there should be a description just because of this.
By using deck-tags you can avoid to put unnecessary information into the deck name and thus making it too long. The tags also allows you to filter the decks you have made for a certain type, very useful if the number of decks you've build here steadily grows and grows.

As for the deck, I would beef up the mana-base a little bit as you have cards that have difficult mana-requirements, which might not be easy with only basic lands and Sandsteppe Citadel.
There are some other defenders that you also could consider, at last for the sideboard:
Axebane Guardian; {2}{G}; 0/3; Add X mana in any combination of colors to your mana pool, where X is the number of creatures with defender you control.
Order of the Stars; {W}; 0/1; As Order of the Stars comes into play, choose a color. Order of the Stars has protection from the chosen color.
Perimeter Captain; {W}; 0/4; Whenever a creature you control with defender blocks, you may gain 2 life.

I also would thing about another win-option because when "Assault Formation" gets removed, you basically only have "Archers' Parapet" left, which will take a long time. When using "Axebane Guradian" "Door to Nothingness" can be an option, "Helix Pinnacle" is also a (slow) way of winning in an deck with enough mana, or you include some big finisher, preferably with some sort of evasion (flying, unblockable, trample, and so on). Red and blue would feature defenders that burn/ mill depending on the number of defenders you control, but those would require a 4th colour splashed.

Greetings
Muktol

"Impact Tremors" could be an interesting card here, as well as "Goblin Bushwhacker".
Tremors help to deal damage (Mogg War Marshal = 3 damage, Akroan Crusader + Skin Invasion = 3 damage) while Bushwhacker helps with haste and a descent +1/+0 boost, and can be used as fodder for your other spells in case things go bad.

Why not splash black instead of white? Gives you access to a lot of control spells AND allows you the use of "Shaman of the Pack". Elvish Promenade, Dwynen's Elite, Eyeblight Massacre, Foul-Tongue Shriek would be interesting cards for this.

Personally I have run elves with the subtype warrior, but there might still be some good cards that fit into this deck:
Imperious Perfect; {2}{G}; 2/2; Other Elf creatures you control get +1/+1. {G}, {T}: Put a 1/1 green Elf Warrior creature token into play.
Nettle Sentinel; {G}; 2/2; Nettle Sentinel doesn't untap during your untap step. Whenever you play a green spell, you may untap Nettle Sentinel.
Talara's Battalion; {1}{G}; 4/3; Play Talara's Battalion only if you played another green spell this turn; Trample
Wren's Run Vanquisher; {1}{G}; 3/3; As an additional cost to play Wren's Run Vanquisher, reveal an Elf card from your hand or pay {3}. Deathtouch

Aside from that:
Collected Company; {3}{G}; Look at the top six cards of your library. Put up to two creature cards with converted mana cost 3 or less from among them onto the battlefield
Beastmaster Ascension; {2}{G}; WHenever a creature attacks it gets a counter. When five counters have been placed all your creatures get +5/+5

As for the splash, I would keep this monoG as it is now because white has nearly nothing that green can't do...if you're in for fast decks. White is the slower and more controlish colour here in my opinion.

Greetings
Muktol

Deck- and how to play description are missing.

Further suggestions:
Order of the Stars; {W}; 0/1; Defender; Protection from a chosen colour.
Axebane Guardian; {2}{G}; 0/3; Defender; Add X mana in any combination of colors to your mana pool, where X is the number of creatures with defender you control
Perimeter Captain; {W}; 0/4; Defender; Whenever a creature you control with defender blocks, you may gain 2 life

Basically when "Assault Formation" gets removed you're done, so why not add some additional finishers?
Door to Nothingness (needs Axebane Guardian), Helix Pinnacle, Entreat the Angels, Platinum Angel, Avacyn, Angel of Hope

Greetings
Muktol

I was thinking about "Merfolk Looter" (or "Mad Prophet") to more often activate Madness. But Menace could be an interesting option.
For now I will shuffle some card-numbers a little bit: -1 Artificer's Epiphany, -1 Cathartic Reunion, +2 Faithless Looting, -2 Looter il-Kor, +2 Insolent Neonate. I have also removed Sokenzan Spellbladeand added Pyre Hound instead.
When I had the chance to do some more testgames I will post how it went.

"Ensoul Artifact" also came back to my mind. Ensoul can convert your 0/2 Ornithopter into a massive 5/5 flying Ornithopter for just 2.
Searching for Ensoul Artifact and Ornithopter brought me to a very effective U/R deck with those cards in it. You can find an article from WotC under the following link:
http://magic.wizards.com/en/events/coverage/ptori/deck-tech-blue-red-ensoul-artifact-2015-08-01

A good card, and at least a good alternative to "Cathartic Reunion". We haven't played the deck all to much so it will have to show if the mana is available to play all those spells discarded with "Cathartic Reunion" and/ or "Faithless Looting".
I'm also looking for a good finisher instead of "Sokenzan Spellblade", but I didn't want to make deck 1000 with "Kiln Fiend"/ "Nivix Cyclops"/ "Wee Dragonauts". Do you have any suggestions on this one?

Each decks should include a deck- and how to play description. The deck description should involve things as the basic idea why you did build this deck, if there's any story behind it, budget, certain cardchoices, especially if they deviate from common lists, legality, or any other information you can give others that will look at your deck. Best do this while you are building the deck because after some days important information's simply may not be remembered.
The how to play description is crucial for beginners. An experienced or expert builder can normally take a look at your deck and see how it should work, but there also are a lot of beginners out there that maybe want to take a look at this and compare it with their own ideas/ decks. Even for more or less standard-decks there should be a description just because of this.

If you want to work more with enter the battlefield (ETB) Effects then"Esperzoa" and "Ghostly Flicker" might be of interest for you.
"Mirrorworks " is a great card for artefact decks as it allows you to copy each artefact you play.
"Stoic Rebuttal " could be a good sideboard card as it gives you some control when needed.

Greetings
Muktol

+1
Beside DedWards suggestions I would, at least for the sideboard, take a look at "Apostle's Blessing" or any other good (colour) protection spell. "Ranger's Guile" or "Vines of Vastwood" would be some other options.

Greetings
Muktol

+1
I would perhaps change from "Mangara of Corondor" to "Silverblade Paladin". Changes the setup a little bit to aggro and less to control and allows your key creatures to survive a little bit longer in fight.
Personally I'm also a big fan of "Bonds of Faith" and "Call to Serve" tough it will be hard to fit one or both cards in here.

Greetings
Muktol

I wouldn't neither, but it could be a sideboard option if all things turn against you. Switching a deck to a complete different win-strategy should normally throw your opponent off balance.
The advantage of those one-time effects is that they are cheap and can provide you with further removal and carddraw (Bone Splinters and Altar's Reap). While further removal-spells may not be to important for this deck carddraw, and thus gaining card advantage, is always an important thing. If two decks are equal in battle and it comes to a standstill it will normally always be card advantage that wins the game, especially if you play a lot of cheap spells that let you run out of handcards rather fast. At the moment the 2 Cryptbreaker are your only option for carddraw.
The question is what do you do when your Blood Artist and/or Zulaport Cutthroat get shot away? Your oppoennts will quickly identify the strengths of this deck and try to deal with them, and that would be those 2 cards. The rest is pretty unexciting, the best would be Geralf's Messenger with a +1/+1 counter ion it as a 4/3.
I would be happy to test the deck but my local playgroup doesn't assemble often enough so that I get the time to do that, I don't even get to test most of my own decks I would like to.

+1, better a long and detailed description as something that just says "Think it out on yourself".
I would probably try to reduce the number of lands to 20 and add some additional spells that profit from sacrificing creatures: "Bone Splinters" as removal or "Altar's Reap" for carddraw. "Blasting Station" can also do a very good job as removal or as burn-engine.
For the sideboard I can recommend "Sylvok Lifestaff" and "Undercity Informer". the first one lets you gain life whenever the equipped creature dies, the last one turns your deck into a mill-deck.
Another, non-budget, enhancement would be "Grave Pact" as it will clear the way for anything that you want to attack with.

Greetings
Muktol

A deck- and how to play description as well as some deck-tags would be fine, after that we can start working on this deck.

Greetings
Muktol

Each decks should include a deck- and how to play description. The deck description should involve things as the basic idea why you did build this deck, if there's any story behind it, budget, certain cardchoices, especially if they deviate from common lists, legality, or any other information you can give others that will look at your deck. Best do this while you are building the deck because after some days important information's simply may not be remembered.
The how to play description is crucial for beginners. An experienced or expert builder can normally take a look at your deck and see how it should work, but there also are a lot of beginners out there that maybe want to take a look at this and compare it with their own ideas/ decks. Even for more or less standard-decks there should be a description just because of this.

A card that fits very good into this deck would be "Stone Haven Outfitter". He boosts the power of equipped creatures but doesn't need to be equipped himself. Also he allows to draw cards whenever a equipped creature dies.
As for the equipment I can recommend "Shuko" as another fast equipment and "Cranial Plating" as very potent one. The plating also perfectly works together with "Darksteel Citadel".
"Dispatch" might also be a card to consider as It provides you with a very potent but cheap removal.

Greetings
Muktol