Mervak Kuulva

0: Tap Mervak Kuulva: Create a 4/4 Black Shade creature token with "Sacrifice this creature at the end of the next players turn."
0: Tap Mervak Kuulva: Put X Loyalty counters on Mervak Kuulva, where X is 2 minus the number of zombies you control.
-10: Destroy all nonblack creatures, then create 4 minus that many 2/2 Black Zombie creature tokens.