, : Create a 1/1 green Snake creature token. If you control ten or more creatures, flip Orochi Eggwatcher.

: Add one mana of any color.

Whenever Orochi Ranger deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step.

: Add .

Whenever Orphans of the Wheat attacks, tap any number of untapped creatures you control. Orphans of the Wheat gets +1/+1 until end of turn for each creature tapped this way.

Vigilance

Orthodoxy Enforcer gets +2/+0 as long as you control two or more artifacts.

At the beginning of your upkeep, each player may put two +1/+1 counters on a creature they control. If a player does, creatures that player controls can't attack you or planeswalkers you control until your next turn.

Choose one —

• Return target creature you control and all Auras you control attached to it to their owner's hand.

• Destroy target creature and you lose life equal to its toughness.

• Return target creature card with mana value 1 or less from your graveyard to the battlefield.

Deathtouch

Afterlife 1 (When this creature dies, create a 1/1 white and black Spirit creature token with flying.)

Orzhov Guildgate enters tapped.

: Add or .

: Add or .

: Orzhov Keyrune becomes a 1/4 white and black Thrull artifact creature with lifelink until end of turn.

Haunt (When this creature dies, exile it haunting target creature.)

When Orzhov Pontiff enters or the creature it haunts dies, choose one —

• Creatures you control get +1/+1 until end of turn.

• Creatures you don't control get -1/-1 until end of turn.

, : Add .

Flying

At the beginning of each end step, if a creature died this turn, put a carrion counter on Osai Vultures.

Remove two carrion counters from Osai Vultures: Osai Vultures gets +1/+1 until end of turn.

When you cast this spell, create a token that's a copy of it, except it isn't legendary.

: Add . Spend this mana only to cast an artifact spell or activate an ability of an artifact.

Paradox — Whenever you cast a spell from anywhere other than your hand, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

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 or discard a card. Then Osseous Sticktwister deals damage equal to its power to each opponent who didn't sacrifice a permanent or discard a card this way.

When Ossuary Rats enters, it deals X damage to target creature or planeswalker an opponent controls, where X is the number of creature cards in your graveyard.

, : Tap target creature.

Magical Tinkering — , , 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.

: Add .

Channel — , Discard Otawara, Soaring City: Return target artifact, creature, enchantment, or planeswalker to its owner's hand. This ability costs less to activate for each legendary creature you control.

Flying

Whenever Oteclan Levitator attacks, target attacking creature without flying gains flying until end of turn.

Flying, lifelink, haste

Whenever Otharri, Suns' Glory attacks, you get an experience counter. Then create a 2/2 red Rebel creature token that's tapped and attacking for each experience counter you have.

, Tap an untapped Rebel you control: Return Otharri from your graveyard to the battlefield tapped.

Flash

When Otherworldly Escort 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.)

, , Remove a charge counter from Otherworldly Escort: Destroy target creature that dealt damage to you this turn.

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.

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)

Trample

Whenever this creature deals combat damage to a player, return target creature card with mutate from your graveyard to your hand.

When Oubliette enters, target creature phases out until Oubliette 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.)

Art rampage 2 (Whenever this creature becomes blocked by a creature, it gets +2/+2 for each creature in the blocker's art beyond the first.)

This spell can't be countered. (This includes by the ward ability.)

Tap up to two target creatures and put a stun counter on each of them. Investigate. (If a permanent with a stun counter would become untapped, remove one from it instead.)

Assist (Another player can pay up to of this spell's cost.)

Counter target spell.

This spell costs less to cast if it targets a green permanent.

Return target nonland permanent an opponent controls to its owner's hand.

Draw a card.

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.

When Outcaster Trailblazer enters, add one mana of any color.

Whenever another creature you control with power 4 or greater enters, draw a card.

Plot (You may pay and exile this card from your hand. Cast it as a sorcery on a later turn without paying its mana cost. Plot only as a sorcery.)

Outland Boar can't be blocked by creatures with power 2 or less.

, Sacrifice Outland Liberator: Destroy target artifact or enchantment.

Daybound (If a player casts no spells during their own turn, it becomes night next turn.)

When Outlaw Stitcher enters, create a 2/2 blue and black Zombie Rogue creature token, then put two +1/+1 counters on that token for each spell you've cast this turn other than the first.

Plot (You may pay and exile this card from your hand. Cast it as a sorcery on a later turn without paying its mana cost. Plot only as a sorcery.)

At the beginning of your upkeep, choose one at random. Create a red and white creature token with those characteristics.

• 3/1 Human Warrior with trample and haste.

• 2/1 Human Cleric with lifelink and haste.

• 1/2 Human Rogue with haste and "When this creature enters, it deals 1 damage to any target."

Put a +1/+1 counter on target creature you control, then it fights target creature you don't control. (Each deals damage equal to its power to the other.)

Adamant — If at least three green mana was spent to cast this spell, the creature you control gains indestructible until end of turn.

As Outpost Siege enters, choose Khans or Dragons.

• Khans — At the beginning of your upkeep, exile the top card of your library. Until end of turn, you may play that card.

• Dragons — Whenever a creature you control leaves the battlefield, Outpost Siege deals 1 damage to any target.

Target opponent exiles the top X cards of their library face down. You may look at and play those cards for as long as they remain exiled. If you cast a spell this way, you may spend mana as though it were mana of any type to cast it.

Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)

Whenever an artifact you control enters, you may return Ovalchase Daredevil from your graveyard to your hand.

Creature cards in graveyards can attack and block as though they were on the battlefield, can block or be blocked only by creature cards in graveyards, are Zombies in addition to their other types, and have undeathtouch. (If they would deal damage to a creature card, exile that creature card instead.)

Creature cards in your graveyard have haste.

Each player reveals a number of cards from the top of their library equal to the number of nonland permanents they control, puts all permanent cards they revealed this way onto the battlefield, and puts the rest into their graveyard.

Overbeing of Myth's power and toughness are each equal to the number of cards in your hand.

At the beginning of your draw step, draw an additional card.

Whenever a player puts a nontoken creature onto the battlefield, that player returns a land they control to its owner's hand.

At the beginning of combat on your turn, you may pay . If you do, put a +1/+1 counter on Overclocked Electromancer.

Whenever Overclocked Electromancer attacks, double its power until end of turn.

Whenever Overclocked Electromancer deals combat damage to a creature, if that creature was dealt excess damage this turn, you get X , where X is that excess damage.

Discard a card, Sacrifice Overeager Apprentice: Add .

, : Add .

Defender

: You gain 1 life.

, Sacrifice Overgrown Arch: Learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)

Defender

: Add for each creature you control with defender.