Harrow, God Eater

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.
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In defeating Auril, Harrow consumed the flesh of
the gods themselves.