Defiler of Aspirations

Devoid (This card has no color)
Whenever an opponent cast a creature spell, they
put the top X cards of their library into their graveyard. Then you may put a creature card
with converted mana cost of X or less from a graveyard onto the battlefield under your control.
X is the amount of different creature types
among permanents you control.
You are indeed not welcome. by PBRunny