Cheapest priced copy (Dominaria): $0.39 at Card Kingdom, near mint, their price list as of .
Sporecrown Thallid 
Creature — Fungus · 2/2 · Uncommon · Dominaria · #181
Each other creature you control that's a Fungus or Saproling gets +1/+1.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.39 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dominaria | 181 | Uncommon | $0.39 | $2.49 |
| Foundations Jumpstart | 718 | Uncommon | $0.39 | — |
2 rulings from Wizards of the Coast
- 27 April 2018If a creature is somehow both a Fungus and a Saproling, Sporecrown Thallid's ability gives it only +1/+1.
- 27 April 2018Because damage remains marked on a creature until it's removed as the turn ends, nonlethal damage dealt to a Fungus or Saproling creature you control may become lethal if Sporecrown Thallid leaves the battlefield during that turn.