You play your 1-drop and Thalia, Guardian of Thraben on turn 2
Negative power is not a concept you see on most Magic cards, but for the most part it functions identically to 0 power, however
You should pick it highly and get your free lands for some nice value
If you don't control an Army, create a 0/0 black Orc Army creature token first.) Flashback, Exile X cards from your graveyard
Animar reduces the cost of your mutate creatures, and makes it particularly easy to swing in for huge commander damage
If you ask any Standard player right now, they would probably tell you that Sultai is a nice deck, but loses badly to Mono Red, which makes it unplayable