Klauth Unrivaled Ancient 2499 (Secret Lair Drop Series)

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.

NM - $43.70
LP - $35.00
MP - $26.20
HP - $17.50
DMG - $8.80