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.
Chris Rahn
Rulings
You choose the color during resolution. This means your opponent does not get to react after knowing the color you chose.
(wotc • 2004-10-04)
Rulings
You choose the color during resolution. This means your opponent does not get to react after knowing the color you chose.
(wotc • 2004-10-04)