Hi, i want to show you a deck which i liked a lot: Vengeur Masque.
It has plus must-counters than simple Mask
It has plus must-counters than simple FEB
It has more protections
It has more utilities
...and i think it's the best deck that can pack the Masknought combo without having fear of a particular hate.
This is my actual list:
3 Windswept Heath
3 Wooded Foothills
4 Savannah
4 Tropical Island
2 Forest
4 Survival of the Fittest
4 Illusionary Mask
4 Phyrexian Dreadnought
4 Volrath's Shapeshifter
1 Squee, Goblin Nabob
4 Brainstorm
1 Sylvan Library
1 Enlightened Tutor
2 Swords to Plowshares
4 Force of Will
2 Meddling Mage
4 Birds of Paradise
3 Wall of Roots
2 Quirion Ranger
1 Gilded Drake
1 Tradewind Rider
1 Phage the Untouchable
1 Sylvan Safekeeper
My sideboard:
1 Meddling Mage
1 Gilded Drake
2 Swords to Plowshares
2 Misdirection
1 Sacred Ground
3 Seal of Cleansing
1 Devout Witness
2 Naturalize
2 Ground Seal
Manabase:
6 Fetchs: They optimize brainstorms and library, and they'll save you if the opponent is packing heavy nonbasic land destruction.
8 Duals:
2 Forests: I needed those 2 basic lands...maybe i want to add a third basic land, a plains. I mean, we have a little count of lands, i think a 17th land may be ok.
Combo Pieces:
8 Masknought: In this deck, we can also act like a mask. Put mask in play then smash your opponent with a great 12/12 trampler. In control matchups, mask is a great weapon...if it enters in play, we won't have any problem with his counters.
4 SotF: It's a great creature fetcher and deck thinner. It's the other combo piece with Mask, if they are both in play the game is over.
4 Volrath's Shapeshifter: It's a great card, it can helps if a drednought is destroyed, and with him in play we can also have our 12/12 without mask. Great "utility" card in this deck. With Phage it's the other finisher of the deck. Maybe 4 are heavy, but they are blue cards and they are very useful in many cases. If i have to cut one of them, i'll do it in favor of the 3rd Quirion or 3rd Meddling.
1 Squee: The first card to fetch with survival. It grants free creatures each turn and it's an eternal blocker.
4 Brainstorm: A must, it can trasform a horrible hand in a magic hand...and it's in synergy with fetchs.
1 Sylvan Library: Very very useful. Maybe the problem is that we can use it only the turn after it enters play, but it helps really a lot. Synergy with shuffles ^^
1 Enlightened Tutor: It takes Sotf/mask/nought/library/anythingelse. A must.
2 Stp: With a lot of decks packing TfC (TinkerForColossus) it's very useful, even if we have our 12/12 and gilded drake...
4 Fow: We have blue. We have a lot of blue cards. We don't have protection. Here it comes force of will
2 Meddling mage: Very very useful card. We can play it vs control naming cunning wish, mana drain and anything else you have in mind...it's also a 2/2 critter

, and we can fetch it with sotf
4 bop: mana mana mana!! We need mana, and they provide us it.
3 Wall of Roots: mana mana mana!!! We need mana, and they provide us it even in opponent's turn for survival...
2 Quirion ranger: it's one of strongest card here...untaps nought if oppo's playing aggro, and it can do many numbers with tradewind rider.
1 Gilded Drake: Uff...it's up to you to find it's use

1 Tradewind rider: If the situation is stalling, reset all and win! Useful vs control...very useful.
1 Phage: Opponent MUST die and he must die NOW.
1 Sylvan Safekeeper: I tried this card here and i didn't regret my choice. It often saves our dreadnoughts from opponent's threats, and also helps shifter...A++
The side is :
1 Meddling Mage<---control, combo
1 Gilded Drake<---oath, TfC
2 Swords to Plowshares<---aggro, oath
2 Misdirection<---control, some combo
1 Sacred Ground<---Smokestack
3 Seal of Cleansing<---oath, ws.dec, dragon
1 Devout Witness<---oath, ws.dec, dragon
2 Naturalize<---like above
2 Ground Seal<---dragon, welder.dec
This is my deck...my greatest problem is if i have to replace the 4th shapeshifter with 3° quirion or meddling...
I said my ideas, now it's up to you
Aka

EDIT: I think that the card that replaces the 4th shifter may be an artifact/enchantement blaster, like devout witness maindeck...can it be?