Vel'Koz, Eye of the Void

Flying, Trample, Ward- {3}.
{1}{u}{b}: Discard up to three cards, for each
card dicarded this way put a -1/-1 counter on up
to three creatures, not named Vel'Koz, Eye of
the Void.
When a creature with a -1/-1 counter on it and
0 toughness dies, draw a card.