Klauth, Unrivaled Ancient Foil

Legendary Creature — Dragon

Flying, haste Whenever Klauth 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.

Ware the darkening sky and the great red wing; he does not suffer competition.