Cheapest priced copy (Tarkir: Dragonstorm Commander): $1.29 at Card Kingdom, near mint, their price list as of .
Caldera Pyremaw 
Creature — Dragon · 3/3 · Rare · Tarkir: Dragonstorm Commander · #33
Flying
Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature. Then this creature deals damage equal to its power to target opponent.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $1.29 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tarkir: Dragonstorm Commander | 33 | Rare | $1.29 | — |
| Tarkir: Dragonstorm Commander | 73 | Rare | $2.49 | — |
One ruling from Wizards of the Coast
- 4 April 2025If Caldera Pyremaw leaves the battlefield in response to its ability, use its power the last time it existed on the battlefield to determine how much damage it deals as its ability resolves.