Sower of Discord 
Creature — Demon
Flying As this creature enters, choose two players. Whenever damage is dealt to one of the chosen players, the other chosen player also loses that much life.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL