Cheapest priced copy (Aether Revolt): $5.99 at Card Kingdom, near mint, their price list as of .
Felidar Guardian 
Creature — Cat Beast · 1/4 · Uncommon · The List · #AER-19
When this creature enters, you may exile another target permanent you control, then return that card to the battlefield under its owner's control.
Legal inCommanderModernLegacyVintage
Banned inPioneer
Not legal inBrawlStandardPauper
5 printings · $5.99 to $47.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Aether Revolt | 19 | Uncommon | $5.99 | $19.99 |
| The List | AER-19 | Uncommon | $5.99 | — |
| Secret Lair Drop | 1487 | Rare | $37.99 | — |
| Secret Lair Drop | 1487★ | Rare | — | $47.99 |
| Secret Lair Drop (Lofi Cat) | 2821 | Rare | $12.99Out of stock | $14.99Out of stock |
2 rulings from Wizards of the Coast
- 9 February 2017If a creature token is exiled this way, it will cease to exist and will not return to the battlefield.
- 9 February 2017After the permanent returns to the battlefield, it will be a new object with no connection to the permanent that was exiled. It won’t have any additional abilities it may have had when it was exiled. Any +1/+1 counters on it or Auras attached to it are removed, and any Equipment will no longer be attached.