Name: Osseous Sticktwister Cost: 1B Type: Artifact Creature -- Scarecrow Pow/Tgh: 2/2 Rules Text: Lifelink Delirium -- At the beginning of your end step, if there are four or more card types among cards in your graveyard, each opponent may sacrifice a nonland permanent of their choice or discard a card. Then this creature deals damage equal to its power to each opponent who didn't sacrifice a permanent or discard a card this way. Set/Rarity: Duskmourn: House of Horror uncommon Price: $0.25

Name: Ossification Cost: 1W Type: Enchantment -- Aura Rules Text: Enchant basic land you control When this Aura enters, exile target creature or planeswalker an opponent controls until this Aura leaves the battlefield. Set/Rarity: The List uncommon, Phyrexia: All Will Be One uncommon, Cowboy Bebop rare Price: $0.25

Name: Ossuary Rats Cost: 5B Type: Creature -- Rat Pow/Tgh: 3/2 Rules Text: When this creature enters, it deals X damage to target creature or planeswalker an opponent controls, where X is the number of creature cards in your graveyard. Set/Rarity: Jumpstart 2022 common Price: $0.21

Name: Osteomancer Adept Cost: 1B Type: Creature -- Squirrel Warlock Pow/Tgh: 2/2 Rules Text: Deathtouch {T}: Until end of turn, you may cast creature spells from your graveyard by foraging in addition to paying their other costs. If you cast a spell this way, that creature enters with a finality counter on it. (To forage, exile three cards from your graveyard or sacrifice a Food. If a creature with a finality counter on it would die, exile it instead.) Set/Rarity: Bloomburrow Promos rare, Bloomburrow rare Price: $0.33

Name: Ostiary Thrull Cost: 3B Type: Creature -- Thrull Pow/Tgh: 2/2 Rules Text: {W}, {T}: Tap target creature. Set/Rarity: Guildpact common Price: $0.04

Name: Ostracize Cost: B Type: Sorcery Rules Text: Target opponent reveals their hand. You choose a creature card from it. That player discards that card. Set/Rarity: Urza's Legacy common, Seventh Edition common Price: $0.11

Name: Oswald Fiddlebender Cost: 1W Type: Legendary Creature -- Gnome Artificer Pow/Tgh: 2/2 Rules Text: Magical Tinkering -- {W}, {T}, Sacrifice an artifact: Search your library for an artifact card with mana value equal to 1 plus the sacrificed artifact's mana value, put it onto the battlefield, then shuffle. Activate only as a sorcery. Set/Rarity: Adventures in the Forgotten Realms Promos rare, Adventures in the Forgotten Realms rare Price: $1.40

Name: Otarian Juggernaut Cost: 4 Type: Artifact Creature -- Juggernaut Pow/Tgh: 2/3 Rules Text: This creature can't be blocked by Walls. Threshold -- As long as there are seven or more cards in your graveyard, this creature gets +3/+0 and attacks each combat if able. Set/Rarity: Odyssey rare Price: $0.26

Name: Oteclan Landmark Cost: W Type: Artifact Rules Text: When this artifact enters, scry 2. Craft with artifact {2}{W} ({2}{W}, Exile this artifact, Exile another artifact you control or an artifact card from your graveyard: Return this card transformed under its owner's control. Craft only as a sorcery.) [Front face. Transforms into Oteclan Levitator.] Set/Rarity: The Lost Caverns of Ixalan common Price: $0.18

Name: Oteclan Levitator Type: Artifact Creature -- Golem Pow/Tgh: 1/4 Rules Text: Flying Whenever this creature attacks, target attacking creature without flying gains flying until end of turn. [Back face. Transforms from Oteclan Landmark. W color indicator.] Set/Rarity: The Lost Caverns of Ixalan common Price: $0.18

Name: Otherworld Atlas Cost: 4 Type: Artifact -- Book Rules Text: {T}: Put a charge counter on this artifact. {T}: Each player draws a card for each charge counter on this artifact. Set/Rarity: Avacyn Restored rare Price: $1.36

Name: Otherworldly Escort Cost: 3W Type: Creature -- Human Detective Pow/Tgh: 4/3 Rules Text: Flash When this creature dies, if it's not a Spirit, return it to the battlefield under its owner's control with four charge counters on it. It's a Spirit Detective. (It's no longer a Human.) {1}{W}, {T}, Remove a charge counter from this creature: Destroy target creature that dealt damage to you this turn. Set/Rarity: Murders at Karlov Manor Commander rare Price: $0.16

Name: Otherworldly Journey Cost: 1W Type: Instant -- Arcane Rules Text: Exile target creature. At the beginning of the next end step, return that card to the battlefield under its owner's control with a +1/+1 counter on it. Set/Rarity: Champions of Kamigawa uncommon, Duel Decks: Divine vs. Demonic uncommon, Modern Masters common, Duel Decks Anthology: Divine vs. Demonic uncommon, Modern Masters 2015 common, The List uncommon Price: $0.16

Name: Oubliette Cost: 1BB Type: Enchantment Rules Text: When this enchantment enters, target creature phases out until this enchantment leaves the battlefield. Tap that creature as it phases in this way. (Auras and Equipment phase out with it. While permanents are phased out, they're treated as though they don't exist.) Set/Rarity: Arabian Nights common, Masters Edition common, Secret Lair Drop rare, Double Masters uncommon, The List uncommon Price: $2.71

Name: Oust Cost: W Type: Sorcery Rules Text: Put target creature into its owner's library second from the top. Its controller gains 3 life. Set/Rarity: Rise of the Eldrazi uncommon, Duel Decks: Zendikar vs. Eldrazi uncommon, The List uncommon, Ravnica: Clue Edition uncommon, Arena Anthology 2 uncommon Price: $0.19

Name: Out of Time Cost: 1WW Type: Enchantment Rules Text: When this enchantment enters, untap all creatures, then those creatures phase out until this enchantment leaves the battlefield. Put a time counter on this enchantment for each creature that phased out this way. Vanishing (At the beginning of your upkeep, remove a time counter from this enchantment. When the last is removed, sacrifice it.) Set/Rarity: Magic Online Promos rare, Modern Horizons 2 rare, Modern Horizons 2 Promos rare, Doctor Who rare Price: $0.26

Name: Out of the Tombs Cost: 2B Type: Enchantment Rules Text: At the beginning of your upkeep, put two eon counters on this enchantment, then mill cards equal to the number of eon counters on it. If you would draw a card while your library has no cards in it, instead return a creature card from your graveyard to the battlefield. If you can't, you lose the game. Set/Rarity: Warhammer 40,000 Commander rare Price: $13.86

Name: Outbreak Cost: 3B Type: Sorcery Rules Text: You may discard a Swamp card rather than pay this spell's mana cost. Choose a creature type. All creatures of that type get -1/-1 until end of turn. Set/Rarity: Prophecy uncommon Price: $0.18

Name: Outflank Cost: W Type: Instant Rules Text: Outflank deals damage to target attacking or blocking creature equal to the number of creatures you control. Set/Rarity: Throne of Eldraine common, Foundations Jumpstart common Price: $0.18

Name: Outlaw Medic Cost: 1W Type: Creature -- Human Rogue Pow/Tgh: 1/3 Rules Text: Lifelink When this creature dies, draw a card. Set/Rarity: Outlaws of Thunder Junction common Price: $0.13