Crosis, the Purger 
Legendary Creature — Dragon
Flying
Whenever Crosis deals combat damage to a player, you may pay 
. If you do, choose a color, then that player reveals their hand and discards all cards of that color.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL