Klauth, Unrivaled Ancient (rus) [Forgotten Realms Commander foil Russian]

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qty in hand

53
edition

Forgotten Realms Commander (50)
language
Foil

yes
card text

Flying, haste
Whenever Klauth, Unrivaled Ancient attacks, add X mana in any combination of colors, where X is the total power of attacking creatures. Spend this mana only to cast spells. Until end of turn, you don't lose this mana as steps and phases end.