Name: Omni-Cheese Pizza Cost: 2 Type: Artifact -- Food Rules Text: When this artifact enters, draw a card. {1}, {T}, Sacrifice this artifact: Add one mana of any color. {2}, {T}, Sacrifice this artifact: You gain 3 life. Set/Rarity: Teenage Mutant Ninja Turtles common Price: $0.13

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: $0.17

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: $0.18

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: $0.83

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: $0.68

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: $0.88

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: $0.28

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: $0.03

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 rare, Zendikar Rising Promos rare, The List rare Price: $1.16

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: $0.13

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: $0.06

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 rare, Zendikar Rising Promos rare, The List rare Price: $1.16

Name: Ondu Spiritdancer Cost: 4W Type: Creature -- Kor Cleric Pow/Tgh: 3/3 Rules Text: Whenever an enchantment you control enters, you may create a token that's a copy of it. Do this only once each turn. Set/Rarity: Commander Masters rare, Duskmourn: House of Horror Commander rare Price: $12.18

Name: Ondu War Cleric Cost: 1W Type: Creature -- Human Cleric Ally Pow/Tgh: 2/2 Rules Text: Cohort -- {T}, Tap an untapped Ally you control: You gain 2 life. Set/Rarity: Oath of the Gatewatch common, The List common Price: $0.13

Name: One Last Job Cost: 2W Type: Sorcery Rules Text: Spree (Choose one or more additional costs.) + {2} -- Return target creature card from your graveyard to the battlefield. + {1} -- Return target Mount or Vehicle card from your graveyard to the battlefield. + {1} -- Return target Aura or Equipment card from your graveyard to the battlefield attached to a creature you control. Set/Rarity: Outlaws of Thunder Junction rare, Outlaws of Thunder Junction Promos rare Price: $0.21

Name: One Ring to Rule Them All Cost: 2BB Type: Enchantment -- Saga Rules Text: (As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.) I -- The Ring tempts you, then each player mills cards equal to your Ring-bearer's power. II -- Destroy all nonlegendary creatures. III -- Each opponent loses 1 life for each creature card in that player's graveyard. Set/Rarity: Tales of Middle-earth Promos rare, The Lord of the Rings: Tales of Middle-earth rare Price: $2.53

Name: One Thousand Lashes Cost: 2WB Type: Enchantment -- Aura Rules Text: Enchant creature Enchanted creature can't attack or block, and its activated abilities can't be activated. At the beginning of the upkeep of enchanted creature's controller, that player loses 1 life. Set/Rarity: Gatecrash uncommon, RNA Guild Kit uncommon Price: $0.10

Name: One with Nothing Cost: B Type: Instant Rules Text: Discard your hand. Set/Rarity: Saviors of Kamigawa rare, The List rare Price: $1.36

Name: One-Eyed Scarecrow Cost: 3 Type: Artifact Creature -- Scarecrow Pow/Tgh: 2/3 Rules Text: Defender Creatures with flying your opponents control get -1/-0. Set/Rarity: Innistrad common Price: $0.21