Both of the target creatures must be exactly the same color or combination of colors. Both being colorless is also okay. If they differ in any way, you can still cast the spell, but it does not do anything on resolution.
04-10-2004
wotc
Colors are checked on resolution.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.