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.
![Ertai's Meddling [Tempest] | Grognard Games](http://grognardgames.com/cdn/shop/products/c8e59f8a-20fb-5c9e-affe-c201623bc625.jpg?v=1637277096)
