Name: Oath of Gideon Cost: 2W Type: Legendary Enchantment Rules Text: When Oath of Gideon enters, create two 1/1 white Kor Ally creature tokens. Each planeswalker you control enters with an additional loyalty counter on it. Set/Rarity: Oath of the Gatewatch Promos rare, Oath of the Gatewatch rare, Commander Masters rare, Pioneer Masters uncommon Price: $0.26

Name: Oath of Kaya Cost: 1WB Type: Legendary Enchantment Rules Text: When Oath of Kaya enters, it deals 3 damage to any target and you gain 3 life. Whenever an opponent attacks a planeswalker you control with one or more creatures, Oath of Kaya deals 2 damage to that player and you gain 2 life. Set/Rarity: War of the Spark Promos rare, War of the Spark rare Price: $0.30

Name: Oath of Lieges Cost: 1W Type: Enchantment Rules Text: At the beginning of each player's upkeep, that player chooses target player who controls more lands than they do and is their opponent. The first player may search their library for a basic land card, put that card onto the battlefield, then shuffle. Set/Rarity: Exodus rare, The List rare Price: $4.09

Name: Oath of Liliana Cost: 2B Type: Legendary Enchantment Rules Text: When Oath of Liliana enters, each opponent sacrifices a creature of their choice. At the beginning of each end step, if a planeswalker entered the battlefield under your control this turn, create a 2/2 black Zombie creature token. Set/Rarity: Eldritch Moon rare, Eldritch Moon Promos rare, Pioneer Masters uncommon Price: $0.36

Name: Oath of Lim-Dûl Cost: 3B Type: Enchantment Rules Text: Whenever you lose life, for each 1 life you lost, sacrifice a permanent other than this enchantment unless you discard a card. (Damage dealt to you causes you to lose life.) {B}{B}: Draw a card. Set/Rarity: Ice Age rare Price: $0.55

Name: Oath of the Grey Host Cost: 3B Type: Enchantment -- Saga Rules Text: (As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.) I -- You and target opponent each create a Food token. II -- Each opponent loses 3 life. Create a Treasure token. III -- Create three tapped 1/1 white Spirit creature tokens with flying. Set/Rarity: The Lord of the Rings: Tales of Middle-earth uncommon Price: $0.19

Name: Oathkeeper, Takeno's Daisho Cost: 3 Type: Legendary Artifact -- Equipment Rules Text: Equipped creature gets +3/+1. Whenever equipped creature dies, return that card to the battlefield under your control if it's a Samurai card. When Oathkeeper is put into a graveyard from the battlefield, exile equipped creature. Equip {2} Set/Rarity: Champions of Kamigawa rare Price: $16.61

Name: Oathsworn Giant Cost: 4WW Type: Creature -- Giant Soldier Pow/Tgh: 3/4 Rules Text: Vigilance Other creatures you control get +0/+2 and have vigilance. Set/Rarity: Ravnica: City of Guilds uncommon, The List uncommon Price: $0.22

Name: Oathsworn Knight Cost: 1BB Type: Creature -- Human Knight Pow/Tgh: 0/0 Rules Text: This creature enters with four +1/+1 counters on it. This creature attacks each combat if able. If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage and remove a +1/+1 counter from it. Set/Rarity: Throne of Eldraine rare, Throne of Eldraine Promos rare Price: $0.19

Name: Oathsworn Vampire Cost: 1B Type: Creature -- Vampire Knight Pow/Tgh: 2/2 Rules Text: This creature enters tapped. You may cast this card from your graveyard if you gained life this turn. Set/Rarity: Rivals of Ixalan uncommon, Jumpstart 2022 uncommon, The Lost Caverns of Ixalan Commander uncommon Price: $0.14

Name: Ob Nixilis Reignited Cost: 3BB Type: Legendary Planeswalker -- Nixilis Loyalty: 5 Rules Text: [+1]: You draw a card and you lose 1 life. [−3]: Destroy target creature. [−8]: Target opponent gets an emblem with "Whenever a player draws a card, you lose 2 life." Set/Rarity: Magic Online Promos mythic, Battle for Zendikar mythic, Battle for Zendikar Promos mythic, Duel Decks: Nissa vs. Ob Nixilis mythic, Commander 2019 mythic, Secret Lair Drop mythic, Commander 2021 mythic, Starter Commander Decks mythic, Duskmourn: House of Horror Commander mythic, Pioneer Masters mythic Price: $0.26

Name: Ob Nixilis of the Black Oath Cost: 3BB Type: Legendary Planeswalker -- Nixilis Loyalty: 3 Rules Text: [+2]: Each opponent loses 1 life. You gain life equal to the life lost this way. [−2]: Create a 5/5 black Demon creature token with flying. You lose 2 life. [−8]: You get an emblem with "{1}{B}, Sacrifice a creature: You gain X life and draw X cards, where X is the sacrificed creature's power." Ob Nixilis of the Black Oath can be your commander. Set/Rarity: Commander 2014 Oversized mythic, Commander 2014 mythic, Legendary Cube Prize Pack mythic, Commander Masters rare Price: $0.80

Name: Ob Nixilis's Cruelty Cost: 2B Type: Instant Rules Text: Target creature gets -5/-5 until end of turn. If that creature would die this turn, exile it instead. Set/Rarity: War of the Spark common, Jumpstart 2022 common, Pioneer Masters common Price: $0.07

Name: Ob Nixilis, Unshackled Cost: 4BB Type: Legendary Creature -- Demon Pow/Tgh: 4/4 Rules Text: Flying, trample Whenever an opponent searches their library, that player sacrifices a creature of their choice and loses 10 life. Whenever another creature dies, put a +1/+1 counter on Ob Nixilis. Set/Rarity: Magic 2015 Promos rare, Magic 2015 rare, Double Masters 2022 rare Price: $4.13

Name: Ob Nixilis, the Fallen Cost: 3BB Type: Legendary Creature -- Demon Pow/Tgh: 3/3 Rules Text: Landfall -- Whenever a land you control enters, you may have target player lose 3 life. If you do, put three +1/+1 counters on Ob Nixilis. Set/Rarity: Zendikar mythic, Iconic Masters mythic, The List mythic, Secret Lair Countdown mythic, Tarkir: Dragonstorm Commander mythic Price: $2.25

Name: Ob Nixilis, the Hate-Twisted Cost: 3BB Type: Legendary Planeswalker -- Nixilis Loyalty: 5 Rules Text: Whenever an opponent draws a card, Ob Nixilis deals 1 damage to that player. [−2]: Destroy target creature. Its controller draws two cards. Set/Rarity: Magic Online Promos uncommon, War of the Spark Promos uncommon, War of the Spark uncommon, Secret Lair Drop uncommon, Jumpstart 2022 uncommon Price: $0.51

Name: Obelisk of Undoing Cost: 1 Type: Artifact Rules Text: {6}, {T}: Return target permanent you both own and control to your hand. Set/Rarity: Antiquities rare, Chronicles rare, Chronicles Foreign Black Border rare, Rinascimento uncommon, Fifth Edition rare, Masters Edition IV rare Price: $0.37

Name: Obelisk of Urd Cost: 6 Type: Artifact Rules Text: Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) As this artifact enters, choose a creature type. Creatures you control of the chosen type get +2/+2. Set/Rarity: Magic 2015 rare, Zendikar Rising Commander rare Price: $2.70

Name: Oblation Cost: 2W Type: Instant Rules Text: The owner of target nonland permanent shuffles it into their library, then draws two cards. Set/Rarity: Onslaught rare, Commander 2011 rare, Commander 2014 rare, Commander 2016 rare, Commander 2021 rare Price: $0.56

Name: Oblivion Crown Cost: 1B Type: Enchantment -- Aura Rules Text: Flash (You may cast this spell any time you could cast an instant.) Enchant creature Enchanted creature has "Discard a card: This creature gets +1/+1 until end of turn." Set/Rarity: Future Sight common Price: $0.30