Vraska, Swarm Guildmaster

+1: Create a 2/2 Black and Green Zombie Elf creature token with menace.
-4: Destroy Target Creature. Put a +1/+1 counter on Each Zombie you control.
-7: Create an Emblem with "At the beginning of your end step, create a 2/2 Black and Green Zombie Elf creature token with menace."