1 O'aka, Traveling Merchant (FIC) 39
1 Oakenform (M20) 341
1 Oashra Cultivator (AKH) 177
1 Oasis Gardener (OTJ) 246
1 Oath of Chandra (OGW) 113
1 Oblivion Strike (OGW) 75
1 Oblivion's Hunger (ZNR) 119
1 Obscura Charm (SNC) 323
1 Observed Stasis (FIC) 40
1 Obsessive Pursuit (TLA) 112
1 Obsessive Skinner (SOI) 220
1 Obsessive Stitcher (M21) 223
1 Obstinate Baloth (BRO) 187
1 Obstinate Gargoyle (MH3) 195
1 Obyra's Attendants (WOE) 63
1 Ochran Assassin (GRN) 194
1 Octo Opus (UNF) 54
1 Octoprophet (M20) 70
1 Octopus Form (TLA) 66
1 Odric, Blood-Cursed (VOW) 243
1 Offspring's Revenge (IKO) 198
1 Oggyar Battle-Seer (STX) 209
1 Ogre Jailbreaker (RTR) 72
1 Oil-Gorger Troll (ONE) 177
1 Oji, the Exquisite Blade (CLB) 436
1 Ojutai Interceptor (DTK) 66
1 Oketra's Attendant (AKH) 22
1 Okiba Reckoner Raid (NEO) 117
1 Oko's Hospitality (ELD) 312
1 Oliphaunt (LTR) 426
1 Olivia's Bloodsworn (SOI) 127
1 Olivia's Dragoon (EMN) 100
1 Olivia's Midnight Ambush (MID) 118
1 Ollenbock Escort (VOW) 27
1 Oltec Archaeologists (LCI) 27
1 Oltec Cloud Guard (LCI) 28
1 Omashu City (TLA) 275
1 Omega Myr (MRD) 223
1 Omega, Heartless Evolution (FIN) 236
1 Omen Hawker (MOM) 70
1 Omen of the Dead (THB) 110
1 Omen of the Hunt (THB) 192
1 Omen of the Sun (THB) 30
1 Omenport Vigilante (OTJ) 21
1 Omenspeaker (M19) 64
1 Ominous Seas (IKO) 61
1 Omniclown Colossus (UNF) 116
1 Onakke Ogre (M21) 155
1 Ondu Champion (BFZ) 149
1 Ondu Giant (ROE) 202
1 Ondu Greathorn (BFZ) 40
1 Ondu Rising (BFZ) 41
1 Ondu War Cleric (OGW) 31
1 One-Clown Band (UNF) 117
1 Onward (AKH) 218
1 Oona's Gatewarden (SHM) 173
1 Oona's Grace (EVE) 27
1 Opal Palace (SOC) 390
1 Opaline Unicorn (THS) 218
1 Open into Wonder (AKH) 64
1 Open the Graves (M19) 112
1 Opera Love Song (FIN) 147
1 Ophidian (WL) 45
1 Opportunity (M14) 66
1 Oppressive Rays (M15) 21
1 Oracle of Dust (BFZ) 63
1 Oracle of Tragedy (MOM) 71
1 Oran-Rief Invoker (BFZ) 182
1 Oran-Rief Recluse (ZEN) 173
1 Orazca Frillback (RIX) 140
1 Orazca Relic (RIX) 181
1 Orb of Dragonkind (AFR) 157
1 Orbital Plunge (EOE) 149
1 Orchard Spirit (ORI) 192
1 Orcish Medicine (LTR) 104
1 Orcish Oriflamme (7E) 206
1 Orcish Paratroopers (UNH) 83
1 Orcus, Prince of Undeath (AFR) 229
1 Ordeal of Erebos (THS) 99
1 Order of the Mirror (MOM) 72
1 Oreplate Pangolin (EOE) 150
1 Oreskos Explorer (PLIST) 98
1 Oreskos Sun Guide (BNG) 22
1 Oreskos Swiftclaw (M19) 31
1 Organ Hoarder (MID) 66
1 Origin of Metalbending (TLA) 187
1 Ornamental Courage (KLD) 164
1 Ornery Dilophosaur (M21) 194
1 Ornery Kudu (AKH) 178
1 Ornitharch (BNG) 23
1 Ornithopter (AER) 167
1 Orthodoxy Enforcer (ONE) 25
1 Orzhov Advokist (MKC) 77
1 Orzhov Guildgate (FDN) 692
1 Orzhov Keyrune (GTC) 233
1 Orzhov Locket (RNA) 236
1 Ossuary Rats (J22) 24
1 Ostrich-Horse (TLA) 188
1 Oswald Fiddlebender (AFR) 304
1 Oteclan Landmark (LCI) 29
1 Otherworldly Gaze (MID) 67
1 Otherworldly Journey (CHK) 37
1 Otherworldly Outburst (EMN) 138
1 Otter-Penguin (TLA) 67
1 Our Market Research Shows That Players Like Really Long Card Names So We Made this Card to Have the Absolute Longest Card Name Ever Elemental (UNH) 107
1 Ouroboroid (EOE) 201
1 Out Cold (MKM) 66
1 Out of the Way (SNC) 52
1 Outland Boar (AER) 132
1 Outland Colossus (ORI) 193
1 Outlaws' Fury (OTJ) 136
1 Outnumber (BFZ) 150
1 Outpost Siege (FRF) 110
1 Outrider of Jhess (ALA) 52
1 Ovalchase Dragster (KLD) 225
1 Overblaze (BOK) 114
1 Overclocked Electromancer (M3C) 110
1 Overflowing Basin (SOC) 392
1 Overgrowth (10E) 283
1 Overgrowth Elemental (M20) 187
1 Overkill (FIN) 109
1 Overrun (FDN) 230
1 Overseer of the Damned (MKC) 132
1 Overwhelm (M15) 189
1 Overwhelming Remorse (BRO) 110
1 Owlbear (AFR) 331
1 Oxidda Finisher (ONE) 143
1 Oxidda Golem (DST) 135
1 Ozai, the Phoenix King (TLA) 235
1 Ozai's Cruelty (TLA) 113