Xenohk, Heart of Avarice

Flying, lifelink

Extort (Whenever you cast a spell, you may pay {w/b}. If you do, each opponent loses 1 life and you gain that much life.)

Whenever you extort, each player manifests dread and you create a Treasure token. (Each player looks at the top two cards of their library, then puts one onto the battlefield face down as a 2/2 creature and the other into their graveyard.
It can be turned face up any time for its mana cost if it's a creature card.)