Serana, Blade's Acolyte

+1: Serana, Blade's Acolyte becomes a 3/2 red and white warrior creature token with indestructible, first strike, and haste until end of turn.
-3: You get an emblem with: "Whenever a creature you control attacks, you gain 1 life."
-6: Creatures you control get +4/+0, first strike, must be blocked if able, and cant have their toughness reduced below 1 until end of turn.