Guardian of the Stone

When Guardian of the Stone enters the battlefield, gain control of Excalibur.
When Guardian of the Stone dies, each Wizard may secretly choose a damaging Instant or Sorcery spell and place it face down.
Reveal the cards simultaneously, the Wizard whose card has the highest damage potential wins and gains control of Excalibur.
Put all these spells in the graveyard.
In the event of a tie, the Wizard with
the highest life total wins.