Karn, the Fallen

{4}{t}: Draw 5 cards.
Whenever Karn, the Fallen deals combat damage to a player, you may search for 2 creature cards, reveal them and put it into your hand, then shuffle your library.
Whenever a creature enters the battlefield, you may put a -1/-1 counter on Karn, the Fallen, if you do it, put a +3/+3 counter on the played creature.