kaii'Vadiir,world's purger

Hexproof, trample, Deathtouch, lifelink
Whenever kaii'Vadiir, enters play or deals combat damage exile all opponents graveyards. If kaii'Vadiir deals combat damage to an opponent you may play any card from exile without paying Mana cost.
{p/g}{p/b}{p/u}: target opponent sacrifices a permanent.