| Name | Cost | Price |
|---|---|---|
| Obsidian Obelisk | $0.75 | |
| Obstinate Baloth | $0.20 | |
| Obstinate Gargoyle | $0.20 | |
| Obuun, Mul Daya Ancestor | $1.25 | |
| Obyra's Attendants // Desperate Parry | $0.15 | |
| Obzedat, Ghost Council | $0.98 | |
| Occupation of Kulrath | — | |
| Occupation of Llanowar | — | |
| Oceanus Dragon | $0.20 | |
| Ocelot Pride | — | |
| Ochran Assassin | $0.29 | |
| Ochre Jelly | $1.06 | |
| Octomancer | $1.33 | |
| Octo Opus | — | |
| Octoprophet | $0.25 | |
| Odds // Ends | $0.50 | |
| Odric, Lunarch Marshal | $0.45 | |
| Odric, Master Tactician | $0.36 | |
| Odylic Wraith | $0.33 | |
| Offering to Asha | $0.10 | |
| Officious Interrogation | — | |
| Oft-Nabbed Goat | $0.30 | |
| Ognis, the Dragon's Lash | $0.26 | |
| Ogre Arsonist | $0.17 |