| Name | Cost | Price |
|---|---|---|
| Open the Armory | $2.78 | |
| Open the Gates | $0.23 | |
| Open the Graves | $0.42 | |
| Open the Omenpaths | $0.12 | |
| Open the Vaults | — | |
| Open the Way | $4.82 | |
| Opera Love Song | $0.34 | |
| Operations Officer | — | |
| Ophidian | $0.12 | |
| Ophidian Eye | $12.19 | |
| Ophiomancer | $4.98 | |
| Opportunistic Dragon | $0.27 | |
| Opportunity | $0.10 | |
| Opposition | $1.49 | |
| Opposition Agent | $17.93 | |
| Oppression | $2.69 | |
| Oppressive Rays | $0.11 | |
| Opt | $0.23 | |
| Opulent Palace | $0.29 | |
| Oracle of Dust | $0.06 | |
| Oracle of Mul Daya | $3.96 | |
| Oracle's Attendants | $0.13 | |
| Oracle's Insight | $0.11 | |
| Oracle's Restoration | $0.17 |