Laquatus's Champion 
Creature — Nightmare Horror
When this creature enters, target player loses 6 life.
When this creature leaves the battlefield, that player gains 6 life.
: Regenerate this creature.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL