Cheapest priced copy (Duskmourn: House of Horror Commander): $0.35 at Card Kingdom, near mint, their price list as of .
Eureka Moment 
Instant · Common · Secrets of Strixhaven Commander · #308
Draw two cards. You may put a land card from your hand onto the battlefield.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
4 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duskmourn: House of Horror Commander | 216 | Common | $0.35 | — |
| Modern Horizons 3 Commander | 260 | Common | $0.35 | $0.49 |
| Secrets of Strixhaven Commander | 308 | Common | $0.35 | — |
| Strixhaven: School of Mages | 184 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 16 April 2021Putting a land card from your hand onto the battlefield is not the same as playing a land. You may do it even if you have already played a land on your turn, or if you're casting Eureka Moment on your opponent's turn.