| Name | Cost | Price |
|---|---|---|
| Olivia's Dragoon | $0.05 | |
| Olivia's Wrath | $0.44 | |
| Olivia Voldaren | $4.88 | |
| Ollenbock Escort | $0.33 | |
| Oloro, Ageless Ascetic | — | |
| Oltec Archaeologists | — | |
| Oltec Cloud Guard | $0.05 | |
| Oltec Matterweaver | $4.56 | |
| Omen Machine | $2.72 | |
| Omen of the Sun | $0.25 | |
| Omenpath Journey | $8.05 | |
| Omenpath to Naya | $0.21 | |
| Omenspeaker | $0.06 | |
| Ominous Asylum | $0.11 | |
| Ominous Cemetery | $0.32 | |
| Ominous Harvest | $0.43 | |
| Ominous Seas | $4.73 | |
| Ominous Sphinx | $0.11 | |
| Omnath, Locus of All | $0.51 | |
| Omnath, Locus of Creation | $5.40 | |
| Omnath, Locus of Mana | $4.26 | |
| Omnath, Locus of Rage | $0.99 | |
| Omnibian | $5.19 | |
| Omniclown Colossus // Pie-roclasm | $0.17 |