Cheapest priced copy (Foundations Jumpstart): $0.35 at Card Kingdom, near mint, their price list as of .
Frost Trickster 
Creature — Bird Wizard · 2/2 · Common · Strixhaven: School of Mages · #43
Flying
When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations Jumpstart | 313 | Common | $0.35 | — |
| The List | STX-43 | Common | $0.35 | — |
| Strixhaven: School of Mages | 43 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 16 April 2021Frost Trickster's ability can target a creature that's already tapped. That creature won't untap during its controller's next untap step.