Thousand Sons

Tzeentch (Unless you control 7 or more lands, if
this permanent were to enter the battlefield, and a
permanent with the ability nurgle, khorne, or
slaanesh is already in play, place this card into your
graveyard instead. During your turn, you may
sacrifice this creature, if you do, draw a card.)
{t}: Sacrifice a creature you control, target
player puts the top X cards of their library into
their graveyard where X is equal to that
creatures' power.