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 - $1.25
Near Mint Non-English - $1.25
Lightly Played - $1.25
Lightly Played Non-English - $1.25
Moderately Played - $1.00
Moderately Played Non-English - $1.00
Heavily Played - $0.75
Heavily Played Non-English - $0.75
Damaged - $0.75
Damaged Non-English - $0.75