Cheapest priced copy (Ikoria: Lair of Behemoths): $0.35 at Card Kingdom, near mint, their price list as of .
Fire Prophecy 
Instant · Common · Ikoria: Lair of Behemoths · #116
Fire Prophecy deals 3 damage to target creature. You may put a card from your hand on the bottom of your library. If you do, draw a card.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ikoria: Lair of Behemoths | 116 | Common | $0.35 | $0.49 |
| Foundations Jumpstart | 547 | Common | $0.35 | — |
2 rulings from Wizards of the Coast
- 17 April 2020While resolving Fire Prophecy, you can't put more than one card on the bottom of your library to draw more than one card.
- 17 April 2020If the target creature is an illegal target by the time Fire Prophecy tries to resolve, the spell won't resolve. You won't have the option to put a card on the bottom of your library.