The Abyss Watchers

When The Abyss Watchers enters the battlefield,
each player creates a 5/5 black Undead Legion
token with, Menace and "This creature must attack each
combat if able and must attack a player who
controls The Abyss Watchers if able."
{2}: Give target player control of The Abyss Watchers.
Whenever this creature dies or is put into exile
from the battlefield, return it to the battlefield transformed under its owner's control at the beginning of the next end step.