Kkjharknor, Dahkluk Gahnov

Trample
Whenever Kkjharknor deals combat damage to a
player, you may prevent that damage and choose
1, 2, or 3 at random, then exile a card from your
graveyard with converted mana cost greater than
or equal to the chosen number. If you do, that
player discards a number of cards equal to the
chosen number, then draws that many cards.
That player loses life equal to the total converted
mana cost of cards discarded this way.