Cheapest priced copy (Phyrexia: All Will Be One): $0.49 at Card Kingdom, near mint, their price list as of .
Ossification 
Enchantment — Aura · Uncommon · Phyrexia: All Will Be One · #26
Enchant basic land you control
When this Aura enters, exile target creature or planeswalker an opponent controls until this Aura leaves the battlefield.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.49 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Phyrexia: All Will Be One | 26 | Uncommon | $0.49 | $0.49 |
| Phyrexia: All Will Be One | 277 | Uncommon | $0.59 | $0.79 |
| Cowboy Bebop | 1 | Rare | — | $3.49 |
| The List | ONE-26 | Uncommon | $0.49 | — |
3 rulings from Wizards of the Coast
- 4 February 2023If Ossification leaves the battlefield before its triggered ability resolves, the target permanent won't be exiled.
- 4 February 2023Auras attached to the exiled permanent will be put into their owners' graveyards. Any Equipment will become unattached and remain on the battlefield. Any counters on the exiled permanent 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.
- 4 February 2023If a token is exiled this way, it will cease to exist and won't return to the battlefield.