Fate will decide whether it's a bed or a tomb.

Glass Casket

When Glass Casket enters, exile target creature an opponent controls with mana value 3 or less until Glass Casket leaves the battlefield.

While Neva's mind wandered the realm of dreams, her body lay protected as mages worked frantically to find a cure for the Wicked Slumber.

Wilds of Eldraine

When Glass Casket enters the battlefield, exile target creature an opponent controls with mana value 3 or less until Glass Casket leaves the battlefield.

Throne of Eldraine

Auras 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.

If Glass Casket leaves the battlefield before its triggered ability resolves, the target creature won't be exiled.

If a token is exiled this way, it will cease to exist and won't return to the battlefield.