Kars, Ultimate Lifeform

+1: Create a 1/1 green Squirrel token with deathtouch and haste.
0: Kars, Ultimate Lifeform becomes a 6/6 Vampire Warrior with flying, lifelink, and indestructible until end of turn.
-8: Sacrifice 5 other permanents, if your current life total is 10 more than your starting total, you win the game.