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.
NM-Mint - $2.10
Lightly Played - $1.90
Moderately Played - $1.70
Heavily Played - $1.50
Damaged - $1.10
NM-Mint Non English - $2.10
Lightly Played Non English - $1.90
Moderately Played Non English - $1.70
Heavily Played Non English - $1.50
Damaged Non English - $1.10