Cheapest priced copy (Wilds of Eldraine): $0.35 at Card Kingdom, near mint, their price list as of .
Rat Out 
Instant · Common · Wilds of Eldraine · #103
Up to one target creature gets -1/-1 until end of turn. You create a 1/1 black Rat creature token with "This token can't block."
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Wilds of Eldraine | 103 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 September 2023You can cast Rat Out without a target just to create a Rat token. However, if you do choose a target, and that target is illegal at the time Rat Out tries to resolve, the spell won't resolve and none of its effects will happen. You won't create a Rat token.