Muktol

I would sideboard "Viridian Corrupter" as you want to be fast and aggresive and thus don't need a artifact removal all the time. Use the free slots to fill up "Ichorclaw Myr" as nobody normaly wants to block a 1/1 that gets a 3/3. Another option could be "Signal Pest", see suggestions. Also I would think of removing "Primal Bellow" as, in the starting phase, it is weaker than most similar spells.

Suggestions, based on my own infect deck (http://www.mtgvault.com/muktol/decks/monog-infect/)
Signal Pest ({1}; 0/1; battlecry; can only be blocked by flying or reach)
Rancor ({G}; +2/+1, trample, if it would go into your graveyard, take it onto your hand instead), Wild Defiance
Evolution Charm ({1}{G}, very flexible. search a land or return a creature from graveyard or creature gains flying), Vines of Vastwood ({G}; target creature gains hexproof; {G} Kicker, if kicked, target creature gets +4/+4), Might of Old Krosa ({G}, +2/+2 if not played in your mainphase, +4/+4 if played in your mainphase)

I hope I was able to give you some ideas
Greetings
Muktol

I would change some things here:
Raise "Elvish Archdruid" to 4 and decrease Elvish Champion to 3. You will need the mana and as you don't have anything that can turn an opponent's land into a forest, so forstwalk will be very situative.
Decrease "Timberwatch Elf" to 3 or even 2. With trample it should be enough to buff a single infect creature and let it attack.
Remove "Joraga Treespeaker", you should have enough mana from "Elvish Archdruid"
Change from "Elvish Herder" to "Rancor". Rancor is harder to remove and even buffs your creature with +2/+1 for only {G}
Add 2 "Bramblewood Paragon". This card buffs all your elf-warriors, gives them trample and, with only cc2, comes rather early.
"Viridian Corrupter" could be put into your sideboard. Yes, you loose a infect creature, but you have enough elves to compensate this.

Some suggestions:
Wirewood Herald (Tutor for elfes), Sylvan Messenger (Carddaw), Elvish Visionary (Carddaw), Ezuri, Renegade Leader (Built in overrun and regenerate for any other elf)

Greetings
Muktol

Some suggestions
Nephalia Drownyard (Land, allows you to mill, even if you don't have any handcards), Jace's Phantasm (At last a sideboardoption against decks that manage to get some creatures out), Pilfered Plans (I think that "Visions of Beyond" won't be enough as carddaw)

Greetings
Muktol

I would rather use "Koth of the Hammer" than "Chandra Nalaar"

Furthermore some things I would change:
Remove "Akki Rockspeaker"...you have better creatures in your deck to fill the free slots.
Remove "Flamekin Harbinger"...I would rather use some draw-spells
Remove "Legion Loyalist"...Most of your burn-elementals allready have trample, and as they nevertheless die EOT, they don't need first strike. Perhaps a sideboard option if you have to play against first strike decks rather often.
Remove "Ogre Sentry"...You want to stay aggresive and thus don't need defenders
Remove "Memnite"...I don't see how it should fit into your plan.
Sideboard "Stigma Lasher"...I hope you don't encounter a lifegain-deck every match ;)
Sideboard "Smelt"...Use when going after artifacts, but again. not every deck utilizes them.
Raise the number of "Ball Lightning" to 4
Raise the number of "Goblin Wardriver" to 3
Raise the number of "Signal Pest" to 4
Raise the number of "Spark Elemental" to 4

Suggestions, based on two of my decks (http://www.mtgvault.com/muktol/decks/monor-tribal-elemental/); (http://www.mtgvault.com/muktol/decks/monor-burn/)
Hellspark Elemental (Elemental with unearth), Nova Chaser (strong element, can be used to re-use your burn-elements like "Spark Elemental"), War Elemental (Strong element), Needle Drop (Carddraw), Searing Blaze (Creature removal), Magma Jet (Card manipulation)

I hope I was able to give you some ideas
Greetings
Muktol

I would remove 1 "Instigator Gang" as it is expensive to play, totaly remove "Lambholt Elder" as it is also expensive and there are easier ways of achiving carddraw and also totaly remove "Pyreheart Wolf" as there is a better card to do this job, see under suggestions. Furthermore think of removing "Mondronen Shaman" or putting it into my sideboard, as a deck willingly will take 4 damage to transform your wolfes back (And 4 damage are nothing compared to what the wolfes themselfs can do)
"Scorned Villager" is a tricky one, as you get mana you need, but the danger is that you get too much mana and will cast more than 2 spells yourself. I Would remove her and try to lower my mana-curve.


Suggestions, based on my R/G werewolf deck (http://www.mtgvault.com/muktol/decks/gr-tribal-werewolfs-2/)
Kruin Outlaw ({1}{R}{R}; 2/2; first strike; transformed 3/3 doublestrike, werewolfs can only be blocked by 2 or more creatures), Young Wolf ({G}; 1/1; undying)
Ghor-Clan Rampager (Pumpcard that don't counts as a spell), Full Moon's Rise ({1}{G}; +1/+0 and trample for all werewolfs; sacrifice to regenerate all werewolfs), Searing Blaze ({R}{R}; 1 damage to player and 1 to a creature of him; landfall, 3 damage o player and 3 to creature), Vines of Vastwood ({G}; creatures gets hexproof; {G} Kicker, if kicked, creature gets +4/+4)
Copperline Gorge, Fire-Lit Thicket, Rootbound Crag, Stomping Ground (Duallands), Mutavault (Manland)

I hope I was able to give you some ideas
Greetings
Muktol

Without "Blade of the Bloodchief" or massive support I found "Falkenrath Exterminator" pretty useless in my deck.
Also you could think of removing the 'Exalted' creatures, but that depends on your playstile (Do you attack with one or with many creatures).
The last option is that you move cards, where you think that you don't need them every match, e.g. Blood Seeker (Only good against mass-decks, like tokens), into your sideboard.
After that you can start looking what you want to replace with better/cheaper/faster/and so on cards, that fit into your plan for this deck.

Greetings
Muktol

You should try to reduce the total number of cards in this deck to 60-64. Every card more than 60 lowers the chance to draw a card you want to have.

Greetings
Muktol

Take a look at http://www.mtgvault.com/muktol/decks/monog-infect/ and take what you like.
It's an infect deck with possible turn 2 kills.

Don't know if you understand German (perhaps there is a good automatic translator), but take a look at
http://www.mtg-forum.de/wiki/primer:casual:mill
It's a good description of nearly every card in detail (They don't update that often, I think they gut stuck with M12) and on the bottom are some sample milldecks.

Ups, didn't see that you already had "Hedron Crab" and therefore are already within modern.

So, here are some suggestions:
Glimpse the Unthinkable ({B}{U}, mill10), Mesmeric Orb (If you don't play many creatures), Mind Funeral ({1}{U}{B}, mill cards until your opponent reveals 4 lands), Tome Scour ({U}, mill 5 cards), Jace, Memory Adept, Visions of Beyond (Carddraw), Extirpate (Remove all copies of a already milled card), Memory Sluice ({U/B} mill 4), Windfall (Carddaw), Millstone ({2}, pay {2} mill 2), Twincast (Copy target spell), Mirari (Copy target spell)

Greetings
Muktol

Just for information, if you want to keep this standard:
M13 and the Innistrad block (Innistrad, Dark Ascension and Avacyn Restored) got rotated out of standard with the publication of Theros

I would try to cut back some of the 1-offs to raise the number of cards you want to draw and you need to draw. Furthermore you could move some creatures that you don't need every match, e.g. "Serra Angel", into your sideboard.
"Grove of the Guardian" could be an idea, as it gives you another token you can populate.

Some suggestions from a quick search:
Armada Wurm (5/5 Wurn+ 5/5 Token), Elspeth, Sun's Champion (3x 1/1 token per turn), Growing Ranks (At your upkeep populate), Murder Investigation, Precinct Captain, Trostani, Selesnya's Voice, Voice of Resurgence
Sideboard: Beckon Apparition (Exile target creature from a graveyard, 1/1 token)

Greetings
Muktol

Read the description of "http://www.mtgvault.com/muktol/decks/how-to-build-a-deck/", there are some tipps how to generaly built a deck.

A mill deck normally uses few creatures but utilizes many spells to mill and control your opponent.

As for the legality, look at the cards you're using, e.g. "Cao Cao, Lord of Wei". Open the card details and on the right side there is a list, where this card can be used.

Greetings
Muktol

Do you want to stay within the 'old' standard legality or use some of the modern-spells?

I would nevertheless do some things here:
Change from "Font of Mythos" to "Howling Mine". It comes earlier, and with some help, e.g. from "Clock of Omen" or "Icy Manipulator", only you benefit from it.
I would also try to raise the number of "Etched Champion" up to 4, it's one of your best beaters, and "Master of Etherium" also up to 4, at last he is a lord and pushes all your artifact creatures.
If you feel that you're having to much mana, I would also remove either "Palladium Myr" or "Vedalken Engineer"
"Master Transmuter" is nice, but in my oppinion, to benefit from it, you need something big, like e.g. "Akroma's Memorial", "Colossus of Akros", "Darksteel Forge", "Elbrus, the Binding Blade", "Blightsteel Colossus", and so on

If you want to work with other cards than Kor, you can take either humans or Cats:
"Auriok Glaivemaster" (Cuman), "Auriok Steelshaper" (Human)
"Leonin Den-Guard" (Cat), "Raksha Golden Cub" (Cat), "Skyhunter Cub" (Cat), "Sunspear Shikari" (Cat)

When working with humans "Avacyn's Collar", "Bladed Bracers" , "Sharpened Pitchfork" and "Silver-Inlaid Dagger" are cheap but good equipments to boost their strength.

Some suggestions, based on my standard U/B mill/discard deck (http://www.mtgvault.com/muktol/decks/bu-standard-discard/)
Consuming Aberration ({3}{U}{B}, Power and toughness based on number of cards in your opponents' graveyards, whenever you cast a spell your opponent is milled until he reveals a land), Drainpipe Vermin ({B}, 1/1, if it dies, pay {B} and your opponent discards a card)
Liliana's Reaver ({2}B}{B}, 4/3, deathtouch, whenever he deals combat damage, you get a 2/2 token and your opponent discards a card)
Wight of Precinct Six (Power and toughness based on number of creatures in your opponents' graveyards), Nighthowler (Power and toughness based on number of creatures in all graveyards)
Disperse ({1}{U}, return target nonland permanent to it's owners hand), Hero's Downfall ({1}{B}{B}, Pointremoval), Psychic Strike ({1}{U}{B}, counter and mill), Mind Rot ({2}{B} your opponent discards 2 cards), Pilfered Plans ({1}{U}{B}, draw and mill)

I hope I was able to give yo some ideas
Greetings
Muktol

Some suggestions, based on my monoG elf warrior deck (http://www.mtgvault.com/muktol/decks/monog-tribal-elf-warriors/)
Imperious Perfect ({1}{G}, 2/2, +1/+1 for all elves, can produce 1/1 elf warrior tokens), Joraga Warcaller ({G}, 1/1, pushes him and all elves, based on the mana you kicked into him), Talara's Battalion ({1}{G}, 4/3, trample), Wren's Run Vanquisher ({1}{G}, 3/3, deathtouch)
Obsidian Battle-Axe ({3}, +2/+1, haste, equipes automaticly to new warriors entering the battlefield)
Oran-Rief, the Vastwood (+1/+1 counter for each green creature that entered the battlefield this turn)

I hope I was able to give you some ideas
Greetings
Muktol

Neither is "Mirri's Guile", depends on what legality you want to use

Another possibility would be "Skullclamp", though it is banned in Legacy, "Glimpse of Nature" or "Lead the Stampede".