Cheapest priced copy (Adventures in the Forgotten Realms): $0.49 at Card Kingdom, near mint, their price list as of .
Gelatinous Cube 
Creature — Ooze · 4/3 · Rare · Adventures in the Forgotten Realms · #105
Engulf — When this creature enters, exile target non-Ooze creature an opponent controls until this creature leaves the battlefield.
Dissolve — {X}{B}: Put target creature card with mana value X exiled with this creature into its owner's graveyard.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.49 to $16.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Adventures in the Forgotten Realms | 105 | Rare | $0.49 | $0.79 |
| Adventures in the Forgotten Realms | 313 | Rare | $0.79 | $0.99 |
| Adventures in the Forgotten Realms Promos | 105a | Rare | — | $16.99 |
| Adventures in the Forgotten Realms Promos | 105p | Rare | $1.49 | $1.49 |
| Adventures in the Forgotten Realms Promos | 105s | Rare | — | $0.79Out of stock |
4 rulings from Wizards of the Coast
- 23 July 2021If a token is exiled this way, it will cease to exist and won't return to the battlefield.
- 23 July 2021If the engulfed creature card leaves exile, perhaps because of the Dissolve ability, it won't return to the battlefield after Gelatinous Cube leaves the battlefield.
- 23 July 2021If Gelatinous Cube leaves the battlefield before its Engulf ability resolves, the target non-Ooze creature won't be exiled.
- 23 July 2021Auras 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.