Guko, Titan of Storms Wrath

When Guko enters the battlefield, sacrifice
it unless it escaped.
Whenever Guko enters the battlefield or attacks, each opponent sacrifices a creature,
you draw cards equal to that creatures
power.
Escape—{u}{u}{b}{b}, Exile five other cards
from your graveyard. (You may cast this card from your graveyard for its escape cost.)