Crajno

Devoid
Crajno can block up to 4 creatures
When Crajno enters the battlefield you may pay {b}{g}{u} if you do put 6 1/1 colorless Slime creature tokens on the battlefield
when black spells are played you may pay {b}{b}{b}{b}{b} if you do tap Crajno, that spell is then exiled
Crajno takes damage in the form of -0/-1s until he is a 4/0 or lower then exile him