Challenger, the Grandmaster

Deathtouch
Mystic Arcanum — At the beginning of your end
step, exile the top card of your library. Until the
end of your next turn, you may play that card.
Pact Boon — Whenever you play a card from
exile, create a Treasure token.
"I am the Challenger now. I am the Challenger...
because you stole my name! YOU!"
—Challenger