Vel'Koz, Eye of the Void

Feast—As this creature enters the battlefield, you
may discard any number of creature cards from
your hand. If you do, return an instant
or sorcery card from your graveyard to your
hand for each creature card discarded this way.
Whenever you cast an instant or sorcery, if that
spell's mana value was three or greater, target
player loses 2 life. If that spell's mana value was
six or greater, target player loses 6 life and you
draw three cards.