Withdraw
Prophecy — common
Instant
Withdraw rulings:
2004-10-04: The creature’s controller gets the option to pay when the spell resolves.
2004-10-04: The two creatures may have different controllers.
2004-10-04: Must target two different creatures.
2004-10-04: You choose on announcement which creature is the one that can be paid to prevent the effect. The payment itself is made on resolution (if at all).