Atalya, Samite Master

Oracle Text

X, T: Choose one —

• Prevent the next X damage that would be dealt to target creature this turn. Spend only white mana on X.

• You gain X life. Spend only white mana on X.

Card Rulings

10/4/2004 Cost modifiers which add a cost are not restricted to only white mana.
10/4/2004 Spending only white mana applies to the ability regardless of which mode you choose.