Cheapest priced copy (Dominaria Remastered): $0.35 at Card Kingdom, near mint, their price list as of .
Wormfang Drake 
Creature — Nightmare Drake · 3/4 · Common · Judgment · #57
Flying
When this creature enters, sacrifice it unless you exile a creature you control other than this creature.
When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
2 printings · $0.35 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dominaria Remastered | 74 | Common | $0.35 | $0.49 |
| Judgment | 57 | Common | $0.35 | $3.49 |
3 rulings from Wizards of the Coast
- 8 December 2022You choose which creature you control to exile (if any) as the enters-the-battlefield ability resolves. Once you make that choice, no player may take actions until the chosen creature is exiled or Wormfang Drake is sacrificed and the ability has finished resolving.
- 8 December 2022If Wormfang Drake leaves the battlefield before its enters-the-battlefield ability resolves, the “leaves-the-battlefield” ability will trigger and resolve first. It won’t return anything. Then the enters-the-battlefield ability will resolve. If you exile a creature you control, it will be exiled indefinitely. Wormfang Drake won’t return it.
- 8 December 2022If you don’t control any other creatures as the enters-the-battlefield ability resolves, you must sacrifice Wormfang Drake.