Excalibur, Sword of Eden [ACR - 72]

Rarity: R #: 72 Creature Type or Sub Type: Legendary Artifact – Equipment Rules Text Contains: This spell costs X less to cast, where X is the total mana value of historic permanents you control. (Artifacts, legendaries, and Sagas are historic.) Equipped creature gets +10/+0 and has vigilance. Equip legendary creature 2