Summon the Champions

When Summon the Champions enters the battlefield, exile the top 6 cards of your library,
then put a Champion counter on up to 6 target creatures you control. Each creature you control
with a Champion counter is legendary.
Whenever a creature you control with a
Champion counter deals damage to an opponent, remove all Champion counters from that creature
and cast one of the cards exiled by Summon the Champions without paying its mana cost.