Moonveil Regent 
Creature — Dragon
Flying Whenever you cast a spell, you may discard your hand. If you do, draw a card for each of that spell's colors. When this creature dies, it deals X damage to any target, where X is the number of colors among permanents you control.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL