Puschkin

My money is on dragonslayer.

It has enough counterspells as it is. Don't overstuff those. As a rule of thumb, run just enough to protect you from the worse and to keep your opponent on his toes. 4-6 counters are usually enough to accomplish that. Anything more than 6 would shift the focus from aggro to control up to the point where the deck centers around how and when to counter instead of what creature to play and when to attack.

That's why I suggested him. While he is easier to get rid of, he is a Blood Moon that can swing. For the same mana you also get a dude - and while he is easier to kill, the opponent has other creatrues to kill as well. Moreover, IF the opponent has a Disenchant type of card in hand, it will become useless if you don't give him targets for it. Finally, chances are that the opponent won't be able to play his solution once he hits play (and if he does, he didn't do his job anyway).

Sadly, we are all getting old ;)

You have way too few creatures to cast your Mask on. Please note that Argothian Enchantress has actually shroud, not Hexproof. That reduces your Mask-targets to just 8 and all of them are fragile. Even if you had a higher creature count, this deck is screaming "INVISIBLE STALKER" through a megaphone! To make room I would cut the Aqueous Form which is a good card but isn't really needed here - if you have no Maskes dude, it doesn't do much, and if you have one, you don't really need it anymore.

I'd also swap Utopia Sprawl for Abundant Growth and would up the enchantment count by replacing one of the instants by something else. Is Boomerang really needed in here? Use Seal of Removal instead if you can't live without bounce. Impulse could be Sylvan Library and so on.

Finally, Arbor Elf. It can only untap Forests and Hinterland Harbor isn't one, so this isn't that useful. You'd be better off with good old Birds of Paradise instead - they not only provide the mana you need for sure, they also have flying, something that your deck lacks otherwise. This might come in handy when you are trying to win a damage race. And Magic history is full of stories (especially in multiplayer) where Birdies save the day when they got ignored but later on Rancor'ed, Might of Oak'ed and Berserk'ed. Okay, you don't run the latter two but you have that Mask instead.

Don't feed the troll. He spammed that very same message all over the place.

They get damage either way because the Trumpet only checks each creature if it attacked. In fact, the Trumpet gives creatures vigiliance, so this is a non-issue either way. But Stasis assures the opponents won't have the mana to pay for Ghostly Prism. (on top of keeping everything else tapped, too)

To my mind Reins of Power is a game breaker in and by itself and doesn't actually need other cards that give the opponents extra creatures. I would cut down on those a tad bid and instead I would add a sacrifice outlet. This is for multiplayer, right? You will have to do your trick more than once. But sometimes you get the creatures of player A to kill player B - and if you can sacrifice them, player A won't get back any! Furthermore, a card like Claws of Gix would allow you to play Reins of Power defensively, saccing everything just to get rid of the creatures, even when they aren't enough to kill.

This isn't the type of deck suited for multiplayer and trying to make it multiplayer would mean serious modifications which ultimately morph this deck into something very different.

Peace Keeper !
Stasis !

Magus of the Moon instead of Blood Moon.

And I wouldn't include Gitaxian Probe just for the Windspear. If you had Guttersnipe or at least one more creature with prowess, maybe, but not in the current build. Don't focus that much on that rare god-hand-win! It will happen very rarely and trying too hard to do it that fast will cost the deck consistency. You might be able to pull off that 3rd turn kill here and there but lose a lot more other games. Which will actually increase the average number of turns you need to kill in addition to lowering your win percentage.
Unfortunately it is a good way to make it front page, so ...

Equilibrium.

EDIT:
Oh, and Into the Roil instead of Unsummon.

5 Players. All of them are opponents and you can attack everyone (even split up attacks). Like free for all. But a player wins if the two players on the other side of the table are dead. It doesn't matter who killed them!

Look at the back of a magic card. Lets say each colour is a player. White wins if black and red are dead. It is possible that two players share a win. Lets say black dies first. Then green dies. Now it's basically white and blue vs red and if red dies, both blue and white win. However, the beauty of this is that there is always the possibility that a player wants to win alone. So, blue might try to kill white first and then red, winning alone. And that gives red a chance to win as well.

That's why this is the king of multiplayer formats. One where diplomacy is certainly needed but doesn't boil down to "let's all gang up on the player we like the least" - everybody has a defined goal how to win and it involves killing different players. Try it. After a while you will never want to play with more or less than 5 people.

* Illu Mask is a top notch tournament card! All you need to know is that it circumvents come-into-play-effects. So you can cast, for example, a Phyrexian Dreadnought without having to sacrifice any creatures. Mask-Nought is an actual tournament deck.

* Force of Savagery:
My decl "Phantom Menace" uses them. It's not build around it, though.
http://www.mtgvault.com/puschkin/decks/phantom-menace/

* Deep Water:
This is unplayable. It was a very situational card for multicoloured decks that needed a lot of blue for certain cumulative upkeeps but today a) you wouldn't build such a deck anymore b) you have way better alternatives. Chromatic Lantern alone makes Deep Water completely obsolete.

* Sorrow's Path:
Added to the list! One of the "worst cards ever" even back in the day! But I never actually tried to break it and will give it a try now that we've got considerably more toys to pair this up with :)

* Goblin Game:
Ugh, this will be tough!

* Verdalken Archmage? Should be budget enough and provides serious amounts of free card draw.

* Prophetic Prism - what for? If you just want to abuse the card draw when you bounce it, Ichor Wellspring is the better alternative.

* Thirst for Knowledge might be an alternative for Fabricate. It doesn't search for a specific artifact but it is card advantage. You said this is for multiplayer, so ... having a longer breath might be more useful than putting all your eggs in one basket.

* Talking of multiplayer, someone WILL have mass artifact destruction. I'd like to see something like Drafna's Restoration in this or at least Hurkyl's Recall type of card to save your day.

* A budget fun card for artifact decks I had great success with is Arcbound Crusher. He would be huge enough if it just counted your artifacts but it gets counters for your opponent's ones, too! Moreover, that modular comes in handy. If you aim for multiplayer, you have to be careful with your resources.

* I am not sold on that Vault Skirge! While I understand your desire for some lifegain, I'd prefer Loxodon Warhammer in that slot. As an equipment, it is reuseable, which, again, is important for multiplayer.

Just couple it with flicker effects. I'll probably put him in that Norin the Wary deck I am still due to create.

It surprises me that so far nobody suggested really weird cards. I thought every second suggestion would be an enchantment or artifact with global effects that are hard to find uses for, Freyalise's Winds, Sands of Time, stuff like that.

They most likely prefer FFA precisely because there "diplomatics" (ganging up) decides who wins and not the quality of decks or playing skills.

Maybe this evening, not much time this weekend.

I notice a development in your decks for sure - in fact I have never seen anybody evolving that fast before! You definately lean towards Johnny now (which I'll give all my thumbs up for that I can muster - I consider getting a new phyrexian one, lol) but at the same time they are getting more stable and well rounded. And like you just described: There will always be the point where you have to stop trying to cover every possibility. Some decks can afford it, some can't.
This deck here for example: When I hit 60 cards, the deck had just finished it's main theme. The Tithe Drinkers were the only adjustment I was able to make. I know it needs artifact and enchantment removal and also probably some library manipulation but there is not enough room left and if I tried to stuff it main deck, I would diminish the chanced to get anything done in actual play. Of course, this come from experience I had with this deck from it's incarnation 10 or so years ago, but still. It's one of those decks where you have to accept the fact that it will lose to certain deck types no matter what.

Anyway, I was trying to make a compliment to you^^ If more people would be willing to learn as you, the Vault would be an even more awesome place. That's why I am so happy that you regularily make it front page now because, hopefully, they'll now learn through your decks.

I am always torn when adding the mana sources to my OCC submissions: If it was a deck I play myself, I would just add Revised duals and some fetchies. But if I do that, the deck value goes through the roof and I know that many users here look for the deck price first and if it is too high they just leave or are biased when discussing the deck. So I try to compromise which sometimes makes the mana base a lot less stable than it could be (even without Revised duals I could improve this by adding "real" fetchies instead of the Mirage ones.

About all the little combos and synergies: This is called a cluster deck where A combos with B, B combos with C, C with D and D finally with A (and maybe B as well). But beware: It is not as good as it looks, at least in this case. You still need a lot of luck and depending on your playgroup you might never be able to pull off what you actually want to do.
Talking about that, this deck could actually make good use of the Scry lands to filter through it's combo pieces.