Crothe, Null Weaver

Creatures you control have efface.
When Crothe, Null Weaver enters the battlefield, target opponent exiles X cards from their hand or
from the top of their library in any combination,
where X is equal to the total power of creatures
you control.
{u}{u}{u}{b}{b}{b}: Exile Crothe, Null Weaver.
Return it to the battlefield under its owner's
control at the beginning of the next end step.