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Card Details
Whenever this creature or another Ally you control enters, you may choose a color. If you do, Allies you control gain protection from the chosen color until end of turn.
2/3
Illustrated by Eric Deschamps
Rulings (1)
Oct 1, 2009
You choose a color (or choose not to) as the triggered ability resolves. Once the color is chosen, it's too late for players to respond.