Artoria Pendragon

Servant, Indestructible, Hexproof.
Artoria enters the battlefield with 50 mana
counters. If Artoria would leave the
battlefield, return her to the Throne of
Heroes instead.
Noble Phantasm: {9}{w},{t}, Remove 40 mana
counters from Artoria Pendragon: Excalibur -
Ignore hexproof, return target servant to the
Throne of Heroes.