Crooked Deal

Comeuppance—{w}{u}{b}(Rather than pay this
card's mana cost, pay {w}{u}{b} instead. Only pay this
cost if it targets a permanent controlled by a player
who attacked you this turn.)
Gain control of target creature or artifact, its
controller loses X life, where X is the card's mana
cost. If this spell was cast for its Comeuppance
cost, you gain X life also.
"So you chose the hard way, huh?"