X can't be 0. Target spell's controller exiles it with X delay counters on it. At the beginning of each of that player's upkeeps, if that card is exiled, remove a delay counter from it. If the card has no delay counters on it, the player puts it onto the stack as a copy of the original spell.
Near Mint - £0.60
Lightly Played - £0.60
Moderately Played - £0.50
Heavily Played - £0.30
Damaged - £0.20
Near Mint Non English - £0.60
Lightly Played Non English - £0.60
Moderately Played Non English - £0.50
Heavily Played Non English - £0.30
Damaged Non English - £0.20