Assault Formation decks are typically Abzan, mostly due to a creature called Lagonna-Band Trailblazer. However, seeing as this card is in the Theros block, and that its replacement (Yoked Ox) is strictly worse, I saw that the next best thing was to go Sultai.
A mostly-overlooked uncommon from Khans is Kheru Bloodsucker. He relies on high-toughness creatures to feed to him, but most high-toughness creatures are worth more than for sac-bait. He bothered me, because I felt very strongly that with the right cards, he would make for an amazing build-around.
Enter Dragons, and Assault Formation, and now we have our answer. Big-butt creatures are viable for aggro, due to their (typically) low cost, and absurd damage output with Formation on the battlefield. Combine this with the "all-in" attitude with Bloodsucker on the board, and you have an aggro deck that can not only win through combat damage, but effectively finish an opponent with life-drain.
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Kheru Bloodsucker - The namesake of the deck. This hungry fella makes removal very dangerous on your opponent's part, as they will get pinged for 2 for every creature that dies. In case of emergency, you can feed your creatures to him yourself, and both drain them down (possibly killing them) and gain life (possibly saving yourself). Obvious removal target, but we have ways of dealing with that...
Sidisi's Faithful, Disowned Ancestor, Archer's Parapet - These three are your cheap, heavy hitters, that each do something on their own whenever they're not attacking. Faithful feeds your buddy, Ancestor grows with time, and Parapet can ping for 1 if the need arises.
Graveblade Marauder - A heavy-hitter that gets heavier for each creature of mine in the yard? Sign me up.
Ruthless Deathfang - Admittedly, this can afford to not be here. One of those things that's nice if it connects, but is still okay if it doesn't.
Foul-Tounge Shriek - If you modify this deck to be more dragon-focused, swap this out for Invocation. Invocation is better...As long as you have enough dragons to trigger the ability. This deck obviously does not, therefore, Shriek it is!
Shape the Sands - This humble defensive spell is a kill spell in our hands. Lets our favorite vampire dodge removal such as Languish. Also excellent protection against certain dragon lords.
Negate - This deck dislikes zero-toughness board wipes (but LOVES straight board wipes!) Notably, this deals with Languish quite well. Also emergency cure for Ugin. Flimsy, yes. But also very cheap.
Assault Formation - This and Bloodsucker are what make the deck work. Without this, it's more or less a sacrifice deck focused on defense. Also lets Parapet attack. Most importantly, it can serve as a defense against "-X/-X" board removal, by bringing everyone barely above the line for Languish.
