Dungeons & Dragons: Adventures in the Forgotten Realms Commander
Type:
Legendary Creature — Dragon
Rarity:
Mythic
Cost:
{5}{R}{G}
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.