Roulkech Deathspeeker

X: Sacrifice X zombies and/or skeletons to add X loyalty counters on Roulkech.
0: Remove card from a graveyard and put a 1/1 black Skeleton creature token with haste or a 2/2 black Zombie creature token onto the battlefield.
-6: Remove all cards from all graveyards and put four 5/5 black Giant Zombie creature token with trample and deathtouch onto the battlefield.