David, the Cannibal

Whenever David, the Cannibal attacks, you may
pay {1} and discard a card. If you do, draw a card.
Whenever you discard one or more nonland cards,
you may exile one of them from your graveyard.
If you do, you may cast it this turn.

"You think we have a choice? Is that it? You kill to
survive...and so do we. We have to take care of our
own. By any means necessary."