| Name | Cost | Price |
|---|---|---|
| Oblivion Sower | $0.52 | |
| Oblivion Stone | $0.34 | |
| Oblivion Strike | $0.07 | |
| Ob Nixilis of the Black Oath | — | |
| Ob Nixilis Reignited | $0.35 | |
| Ob Nixilis, the Adversary | $3.34 | |
| Ob Nixilis, the Fallen | $5.79 | |
| Ob Nixilis, the Hate-Twisted | $0.72 | |
| Ob Nixilis, Unshackled | $4.74 | |
| Oboro, Palace in the Clouds | $16.65 | |
| Obosh, the Preypiercer | $0.26 | |
| Obscura Ascendancy | $0.49 | |
| Obscura Charm | $0.18 | |
| Obscura Confluence | $0.26 | |
| Obscura Interceptor | $0.15 | |
| Obscura Storefront | $0.38 | |
| Obscuring Aether | $0.18 | |
| Obscuring Haze | $4.07 | |
| Obsessive Astronomer | $0.15 | |
| Obsessive Pursuit | $1.16 | |
| Obsessive Search | $0.18 | |
| Obsessive Stitcher | $0.25 | |
| Obsianus Golem | $67.99 | |
| Obsidian Fireheart | $0.63 |