Shane, Kingpin of the Black

Shane's Power & Toughness are equal to your devotion to black.
{t}: at end of turn, if you and target player each control an artifact, you may trade control of them.
The opponent's artifact's mana value must be
at least equal to your artifact's mana value
+ the total damage dealt to your opponent
and their creatures this turn - total damage
dealt to you and yours. (Artifact tokens are
treated as having 2 mana value.)