Atalya, Samite Master — ruling 1

Cost modifiers which add a cost are not restricted to only white mana.

Atalya, Samite Master — ruling 2

Spending only white mana applies to the ability regardless of which mode you choose.

Atalya, Samite Master : règles, fonctionnement et interactions (MTG)

Atalya, Samite Master is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

, : 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.

How it works : Atalya, Samite Master

Original English text — Wizards of the Coast / Scryfall

#1October 4, 2004· Wizards of the Coast
Cost modifiers which add a cost are not restricted to only white mana.
No other card is named in this ruling.
#2October 4, 2004· Wizards of the Coast
Spending only white mana applies to the ability regardless of which mode you choose.
No other card is named in this ruling.