Cheapest priced copy (The List): $0.35 at Card Kingdom, near mint, their price list as of .
Fungal Infection 
Instant · Common · Dominaria · #94
Target creature gets -1/-1 until end of turn. Create a 1/1 green Saproling creature token.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dominaria | 94 | Common | $0.39 | $1.49 |
| Jumpstart 2022 | 416 | Common | $0.39 | — |
| The List | DOM-94 | Common | $0.35 | — |
2 rulings from Wizards of the Coast
- 27 April 2018The target creature will be on the battlefield when you create the Saproling token, even if it’s about to die for having 0 toughness or lethal damage. Its abilities may affect the token’s creation or trigger when the token enters the battlefield. Abilities that trigger this way will resolve after the target creature has died.
- 27 April 2018If the target creature is an illegal target by the time Fungal Infection tries to resolve, the spell doesn’t resolve. You won’t create a Saproling token.