Underhanded Designs 
Enchantment
Whenever an artifact you control enters, you may pay . If you do, each opponent loses 1 life and you gain 1 life.
, Sacrifice this enchantment: Destroy target creature. Activate only if you control two or more artifacts.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL