Cheapest priced copy (Modern Horizons): $0.35 at Card Kingdom, near mint, their price list as of .
Fountain of Ichor 
Artifact · Common · Modern Horizons · #223
{T}: Add one mana of any color.
{3}: This artifact becomes a 3/3 Dinosaur artifact creature until end of turn.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons | 223 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 14 June 2019If you turn Fountain of Ichor into a creature but haven't controlled it continuously since your most recent turn began, you won't be able to activate its mana ability or attack with it.