Mercy Hartigan, Converted

Whenever an artifact creature you control deals
damage to an opponent, you may sacrifice it. If
you do, add {b} or {r} to your mana pool. You
don't lose this mana as steps and phases end.
What You've Become — {10}{r}{b}, Sacrifice Mercy
Hartigan, Converted: You and target opponent
lose X life, where X is the greatest power among
artifact creatures you control. If you control a
creature named The CyberKing, this ability has
affinity for artifacts.