Excalibur, Sword of Eden is a rare Legendary Artifact — Equipment card from Assassin's Creed (ACR), collector number 72. Current market price: $18.68 (foil $19.34), TCGplayer market prices via Scryfall.
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}