Cheapest priced copy (Foundations Jumpstart): $0.35 at Card Kingdom, near mint, their price list as of .
Pyrophobia 
Sorcery · Common · Modern Horizons · #141
Pyrophobia deals 3 damage to target creature. Cowards can't block this turn.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations Jumpstart | 587 | Common | $0.35 | — |
| Modern Horizons | 141 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 14 June 2019If the target creature is an illegal target by the time Pyrophobia tries to resolve, the spell doesn't resolve. Cowards can block if they're otherwise allowed to.
- 14 June 2019Because it doesn't modify the characteristics of creatures, Pyrophobia can affect Cowards that enter the battlefield or creatures that become Cowards after the spell resolves.