Orzhov Enforcer - Mystery Booster 2: Reprints from Across Magic's History (Uncommon)

Orzhov Advokist - Mystery Booster 2: Reprints from Across Magic's History (Uncommon)

Order of Midnight // Alter Fate - Mystery Booster 2: Reprints from Across Magic's History (Uncommon)

Ophidian Eye - Mystery Booster 2: Reprints from Across Magic's History (Common)

Ophidian - Mystery Booster 2: Reprints from Across Magic's History (Common)

On Serra's Wings - Mystery Booster 2: Reprints from Across Magic's History (Uncommon)

Oneirophage - Mystery Booster/The List (Uncommon)

Omen of the Sun - Mystery Booster 2: Reprints from Across Magic's History (Common)

Olivia's Bloodsworn - Mystery Booster/The List: Reprints from Across Magic's History (Uncommon)

Ogre Arsonist - Mystery Booster 2: Reprints from Across Magic's History (Uncommon)

Oblivion Strike - Mystery Booster/The List: Reprints from Across Magic's History (Common)

Oblivion Ring - Mystery Booster 2: Reprints from Across Magic's History (Common)

Oathsworn Giant - Mystery Booster 2: Reprints from Across Magic's History (Uncommon)

Oath of Nissa - Mystery Booster 2: Reprints from Across Magic's History (Rare)

Oakhame Adversary - Mystery Booster 2: Reprints from Across Magic's History (Uncommon)

Nylea's Presence - Mystery Booster 2: Reprints from Across Magic's History (Common)

Norwood Archers - Mystery Booster 2: Reprints from Across Magic's History (Common)

Noose Constrictor - Mystery Booster 2: Reprints from Across Magic's History (Uncommon)

Nomad Outpost - Mystery Booster 2: Reprints from Across Magic's History (Uncommon)

Noble Purpose - Mystery Booster 2: Reprints from Across Magic's History (Uncommon)

Nissa's Judgment - Mystery Booster 2: Reprints from Across Magic's History (Uncommon)

Nimble Birdsticker - Mystery Booster/The List: Reprints from Across Magic's History (Common)

Nikko-Onna - Mystery Booster 2: Reprints from Across Magic's History (Uncommon)