| Name | Cost | Price |
|---|---|---|
| Overseer of Vault 76 | $0.27 | |
| Oversimplify | $0.21 | |
| Oversold Cemetery | $1.82 | |
| Overtaker | $0.74 | |
| Over the Edge | $0.18 | |
| Over the Top | $0.21 | |
| Overwhelm | $0.04 | |
| Overwhelming Denial | $0.17 | |
| Overwhelming Forces | $1.08 | |
| Overwhelming Instinct | $0.30 | |
| Overwhelming Remorse | $0.21 | |
| Overwhelming Stampede | $2.08 | |
| Overwhelming Victory | $0.32 | |
| Ovika, Enigma Goliath | $0.23 | |
| Ovinize | $0.09 | |
| Ovinomancer | $0.10 | |
| Oviya, Automech Artisan | $0.93 | |
| Oviya Pashiri, Sage Lifecrafter | $0.23 | |
| Owlbear | $0.22 | |
| Owlbear Cub | — | |
| Owlbear Shepherd | $0.14 | |
| Owl Familiar | $0.31 | |
| Owlin Spiralmancer | $0.40 | |
| Ox Drover | $0.49 |