name: Excalibur, Sword of Eden
originalText: This spell costs {X} less to cast, where X is the total mana value of historic permanents you control.
  Equipped creature gets +10/+0 and has vigilance.
  Equip legendary creature {2}
printings: ACR
text: 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}
type: Legendary Artifact — Equipment