Kaon, Calamity Reaver

Flying, Trample, Calamity 2
When this creature enters the battlefield, search
your library for a card named Dominarus, Chaos
Drake, and put it into your hand.
Creatures you control have Calamity X, where X
is half their mana cost minus one, rounded up.
The two of them hunt the weak, and destroy all who
stand in their way.