Black Market Auctioneer

Bodhi (When you cast an artifact or enchantment
spell, you may have target opponent gains 2 life and
tap this permanent to draw a card. Use this ability
once a turn.)
Exile target creature you control with a CMC of
X, {t}: Exile target artifact or enchantment spell
with a CMC equal to X. During its controller's upkeep, starting with you each player may bid
any amount of life. The last to bid returns that permanent to play under their control.