| Name | Edition | Colour | Type | Cost | Power | Rarity | $ |
|---|---|---|---|---|---|---|---|
| Opal Acrolith | US | White | Enchantment | 2W | Uncommon | 0.28 | |
| Opal Archangel | US | White | Enchantment | 4W | Rare | 2.28 | |
| Opal Avenger | UL | White | Enchantment | 2W | Rare | 0.64 | |
| Opal Caryatid | US | White | Enchantment | W | Common | 0.15 | |
| Opal Champion | UL | White | Enchantment | 2W | Common | 0.14 | |
| Opal Gargoyle | US | White | Enchantment | 1W | Common | 0.15 | |
| Opal Guardian | TSN | White | Enchantment | WWW | Rare | 0.47 | |
| Opal Titan | US | White | Enchantment | 2WW | Rare | 1.02 | |
| Opal-Eye, Konda's Yojimbo | BK | White | Legendary Creature - Fox Samurai | 1WW | 1/4 | Rare | 1.18 |
| Opalescence | UD | White | Enchantment | 2WW | Rare | 1.54 | |
| Opaline Bracers | FD | Artifact | Artifact - Equipment | 4 | Common | 0.13 | |
| Opaline Sliver | TSN | Multi | Creature - Sliver | 1WU | 2/2 | Uncommon | 0.37 |
| Open the Vaults | M10 | White | Sorcery | 4WW | Rare | 1.57 | |
| Ophidian | WL | Blue | Summon Snake | 2U | 1/3 | Common | 0.25 |
| Ophidian | DDJC | Blue | Creature - Snake | 2U | 1/3 | Common | 0.25 |
| Ophidian (DCI) | P | Blue | Summon Snake | 2U | 1/3 | Rare | 14.00 |
| Ophidian Eye | TSN | Blue | Enchantment - Aura | 2U | Common | 0.17 | |
| Opportunist | TP | Red | Summon Soldier | 2R | 2/2 | Uncommon | 0.23 |
| Opportunity | UL | Blue | Instant | 4UU | Uncommon | 0.27 | |
| Opportunity | 7E | Blue | Instant | 4UU | Uncommon | 0.32 | |
| Opposition | UD | Blue | Enchantment | 2UU | Rare | 3.51 | |
| Opposition | 7E | Blue | Enchantment | 2UU | Rare | 3.49 | |
| Oppression | US | Black | Enchantment | 1BB | Rare | 1.08 | |
| Oppression | 7E | Black | Enchantment | 1BB | Rare | 0.69 | |
| Oppressive Will | SK | Blue | Instant | 2U | Common | 0.14 | |
| Opt | IN | Blue | Instant | U | Common | 0.28 |