Cheapest priced copy (Throne of Eldraine): $0.35 at Card Kingdom, near mint, their price list as of .
Glass Casket 
Artifact · Uncommon · Wilds of Eldraine · #16
When this artifact enters, exile target creature an opponent controls with mana value 3 or less until this artifact leaves the battlefield.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
3 printings · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Throne of Eldraine | 15 | Uncommon | $0.35 | $0.49 |
| Throne of Eldraine | 393 | Uncommon | $0.35 | $0.79 |
| Wilds of Eldraine | 16 | Uncommon | $0.35 | $0.49 |
6 rulings from Wizards of the Coast
- 4 October 2019If a token is exiled this way, it will cease to exist and won't return to the battlefield.
- 4 October 2019If Glass Casket leaves the battlefield before its triggered ability resolves, the target creature won't be exiled.
- 4 October 2019Auras attached to the exiled creature will be put into their owners' graveyards. Any Equipment will become unattached and remain on the battlefield. Any counters on the exiled creature will cease to exist. When the card returns to the battlefield, it will be a new object with no connection to the card that was exiled.
- 1 September 2023Auras attached to the exiled creature will be put into their owners' graveyards. Any Equipment will become unattached and remain on the battlefield. Any counters on the exiled creature will cease to exist. When the card returns to the battlefield, it will be a new object with no connection to the card that was exiled.
- 1 September 2023If a token is exiled this way, it will cease to exist and won't return to the battlefield.
- 1 September 2023If Glass Casket leaves the battlefield before its triggered ability resolves, the target creature won't be exiled.