Cheapest priced copy (Tarkir: Dragonstorm Promos): $0.49 at Card Kingdom, near mint, their price list as of .
Flamehold Grappler 
Creature — Human Monk · 3/3 · Rare · Tarkir: Dragonstorm Promos · #185p
First strike
When this creature enters, copy the next spell you cast this turn when you cast it. You may choose new targets for the copy. (A copy of a permanent spell becomes a token.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tarkir: Dragonstorm Promos | 185p | Rare | $0.49 | $0.49 |
| Tarkir: Dragonstorm Promos | 185s | Rare | — | $0.49 |
| Tarkir: Dragonstorm | 185 | Rare | $0.49 | $0.49 |
| Tarkir: Dragonstorm | 359 | Rare | $0.49 | $0.79 |
9 rulings from Wizards of the Coast
- 4 April 2025If the copied spell divides damage or distributes counters among a number of targets, the division and number of targets can’t be changed. If you choose new targets, you must choose the same number of targets.
- 4 April 2025If the spell that’s copied is modal (that is, it says “Choose one —” or the like), the copy will have the same mode or modes. You can’t choose different ones.
- 4 April 2025You can’t choose to pay any additional costs for the copy. However, effects based on any additional costs that were paid for the original spell are copied as though those same costs were paid for the copy too.
- 4 April 2025After Flamehold Grappler’s last ability resolves, the next spell you cast that turn will be copied whether or not it has targets.
- 4 April 2025The copy is created on the stack, so it’s not “cast.” Abilities that trigger when a player casts a spell won’t trigger.
- 4 April 2025If the spell that’s copied has an X whose value was determined as it was cast, the copy will have the same value of X.
- 4 April 2025The copy created by Flamehold Grappler’s last ability resolves before the spell it’s copying. It resolves even if the original spell is countered before the copy is created.
- 4 April 2025If the spell has any targets, the copy will have the same targets unless you choose new ones. You may change any number of the targets, including all of them or none of them. The new targets must be legal.
- 4 April 2025A resolving copy of a permanent spell becomes a token. That token isn’t “created” and won’t interact with abilities that care about tokens being created.