Cheapest priced copy (Modern Masters): $4.49 at Card Kingdom, near mint, their price list as of .
Dragonstorm 
Sorcery · Special · Time Spiral Timeshifted · #60
Search your library for a Dragon permanent card, put it onto the battlefield, then shuffle.
Storm (When you cast this spell, copy it for each spell cast before it this turn.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
4 printings · $4.49 to $54.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| From the Vault: Dragons | 5 | Rare | — | $13.99 |
| Modern Masters | 111 | Rare | $4.49 | $19.99 |
| Scourge | 90 | Rare | $4.99Out of stock | $54.99 |
| Time Spiral Timeshifted | 60 | Special | $4.49 | $32.99 |
4 rulings from Wizards of the Coast
- 8 December 2022The triggered ability that creates the copies can itself be countered by anything that can counter a triggered ability. If it is countered, no copies will be put onto the stack.
- 8 December 2022A copy of a spell can be countered like any other spell, but it must be countered individually. Countering a spell with storm won't affect the copies.
- 8 December 2022The copies are put directly onto the stack. They aren't cast and won't be counted by other spells with storm cast later in the turn.
- 8 December 2022Spells cast from zones other than a player's hand and spells that were countered are counted by the storm ability.