Name: Omarthis, Ghostfire Initiate Cost: XX Type: Legendary Creature -- Spirit Snake Pow/Tgh: 0/0 Rules Text: Omarthis enters with X +1/+1 counters on it. Whenever you put one or more +1/+1 counters on another colorless creature, you may put a +1/+1 counter on Omarthis. When Omarthis dies, manifest a number of cards from the top of your library equal to the number of counters on it. Set/Rarity: Commander Masters mythic Price: $0.99

Name: Omega Myr Cost: 2 Type: Artifact Creature -- Myr Pow/Tgh: 1/2 Rules Text: Set/Rarity: Mirrodin common Price: $0.17

Name: Omen Machine Cost: 6 Type: Artifact Rules Text: Players can't draw cards. At the beginning of each player's draw step, that player exiles the top card of their library. If it's a land card, the player puts it onto the battlefield. Otherwise, the player casts it without paying its mana cost if able. Set/Rarity: New Phyrexia rare Price: $1.96

Name: Omen of the Dead Cost: B Type: Enchantment Rules Text: Flash When this enchantment enters, return target creature card from your graveyard to your hand. {2}{B}, Sacrifice this enchantment: Scry 2. Set/Rarity: Theros Beyond Death common Price: $0.05

Name: Omen of the Sun Cost: 2W Type: Enchantment Rules Text: Flash When this enchantment enters, create two 1/1 white Human Soldier creature tokens and you gain 2 life. {2}{W}, Sacrifice this enchantment: Scry 2. Set/Rarity: Theros Beyond Death common, The List common, Commander Masters common Price: $0.05

Name: Omenport Vigilante Cost: 1W Type: Creature -- Human Mercenary Pow/Tgh: 2/2 Rules Text: This creature has double strike as long as you've committed a crime this turn. (Targeting opponents, anything they control, and/or cards in their graveyards is a crime.) Set/Rarity: Outlaws of Thunder Junction uncommon Price: $0.04

Name: Ominous Cemetery Type: Land Rules Text: {T}: Add {C}. {5}, {T}, Exile this land: Target creature's owner shuffles it into their library. Set/Rarity: Doctor Who uncommon Price: $0.14

Name: Ominous Parcel Cost: 1 Type: Artifact Rules Text: {2}, {T}, Sacrifice this artifact: Search your library for a basic land card, reveal it, put it into your hand, then shuffle. {5}, {T}, Sacrifice this artifact: It deals 4 damage to target creature. Set/Rarity: Streets of New Capenna common Price: $0.04

Name: On Alert Cost: 2W Type: Instant -- Adventure Rules Text: Target creature gets +2/+2 until end of turn. Untap it. (Then exile this card. You may cast the creature later from exile.) [Related to Silverflame Squire.] Set/Rarity: Magic Online Promos common, Throne of Eldraine common, The List common Price: $0.03

Name: On Serra's Wings Cost: 3W Type: Legendary Enchantment -- Aura Rules Text: Enchant creature Enchanted creature is legendary, gets +1/+1, and has flying, vigilance, and lifelink. Set/Rarity: Dominaria uncommon, The List uncommon, Commander Legends uncommon Price: $0.17

Name: On Thin Ice Cost: W Type: Snow Enchantment -- Aura Rules Text: Enchant snow land you control When this Aura enters, exile target creature an opponent controls until this Aura leaves the battlefield. Set/Rarity: Modern Horizons rare Price: $0.96

Name: On Wings of Gold Cost: 3W Type: Enchantment Rules Text: Creatures you control that are Zombies and/or tokens get +1/+1 and have flying. Whenever one or more cards leave your graveyard, create a 1/1 white Zombie creature token. Set/Rarity: Aetherdrift Commander rare Price: $0.27

Name: On the Job Cost: 2WW Type: Instant Rules Text: Creatures you control get +2/+1 until end of turn. Investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.") Set/Rarity: Murders at Karlov Manor common Price: $0.06

Name: Onakke Oathkeeper Cost: 1W Type: Creature -- Ogre Spirit Pow/Tgh: 0/4 Rules Text: Creatures can't attack planeswalkers you control unless their controller pays {1} for each creature they control that's attacking a planeswalker you control. {4}{W}{W}, Exile this card from your graveyard: Return target planeswalker card from your graveyard to the battlefield. Set/Rarity: Commander Masters rare Price: $0.31

Name: Ondu Cleric Cost: 1W Type: Creature -- Kor Cleric Ally Pow/Tgh: 1/1 Rules Text: Whenever this creature or another Ally you control enters, you may gain life equal to the number of Allies you control. Set/Rarity: Zendikar common Price: $0.65

Name: Ondu Greathorn Cost: 3W Type: Creature -- Beast Pow/Tgh: 2/3 Rules Text: First strike Landfall -- Whenever a land you control enters, this creature gets +2/+2 until end of turn. Set/Rarity: Battle for Zendikar common, The List common Price: $0.04

Name: Ondu Inversion Cost: 6WW Type: Sorcery Rules Text: Destroy all nonland permanents. [Front face. Related to Ondu Skyruins.] Set/Rarity: Magic Online Promos rare, Zendikar Rising Promos rare, Zendikar Rising rare, The List rare Price: $0.96

Name: Ondu Knotmaster Cost: 2WB Type: Creature -- Kor Rogue Pow/Tgh: 2/2 Rules Text: Lifelink Whenever another modified creature you control dies, put two +1/+1 counters on this creature. [Related to Throw a Line.] Set/Rarity: Modern Horizons 3 uncommon Price: $0.07

Name: Ondu Rising Cost: 1W Type: Sorcery Rules Text: Whenever a creature attacks this turn, it gains lifelink until end of turn. Awaken 4--{4}{W} (If you cast this spell for {4}{W}, also put four +1/+1 counters on target land you control and it becomes a 0/0 Elemental creature with haste. It's still a land.) Set/Rarity: Battle for Zendikar uncommon Price: $0.09

Name: Ondu Skyruins Type: Land Rules Text: This land enters tapped. {T}: Add {W}. [Back face. Related to Ondu Inversion.] Set/Rarity: Magic Online Promos rare, Zendikar Rising Promos rare, Zendikar Rising rare, The List rare Price: $0.96