The One True Excalibur

Soulbound, Vanishing 2.
T.O.T.Excalibur equips to whichever creature he is soulbound to, T.O.T.Excalibur can only bind to a creature with a different name to his or Caliburn's previous target if he has left the battlefield since.

Equipped Creature Has Flying, Indestructible, Double Strike and "when this creature deals combat damage choose one:".
• T.O.T.Excalibur Deals 4 Damage to any target.
•Destroy Target Creature with 4 or more Power.
•Untap, Put a Time Counter on T.O.T.Excalibur