(You may begin the game with one champion on the battlefield.)
At the beginning of each player's upkeep, that player puts the top two cards of his or her library into his or her graveyard.
Intervene – As long as a graveyard has twelve or more cards in it, Mirko is a 3/2 Vampire Rogue creature with flying. He's still a champion.
See Challenge # 073. Another illustration of the Champion type that I designed for the crossover of Challenge # 070 and Challenge # 031. Discussion over on Emmara Tandris.