Aratoske, Soul of Ikoria

+2: Create a 3/3 black Nightmare Demon Cat token with lifelink, deathtouch or vigilance. (your choice)
-3: Until end of turn, Aratoske, becomes a 3/3 Demon Cat Creature with persist. whenever this creature mutates, put loyalty counter on it.
-11: You get an emblem with: “Whenever a Creature you control triggers a mutation, it triggers an additional time."