Menace

Whenever Obeka, Splitter of Seconds deals combat damage to a player, you get that many additional upkeep steps after this phase.

The owner of target nonland permanent shuffles it into their library, then draws two cards.

Obliterating Bolt deals 4 damage to target creature or planeswalker. If that creature or planeswalker would die this turn, exile it instead.

Devoid (This card has no color.)

Exile target creature.

Companion — Your starting deck contains only cards with odd mana values and land cards. (If this card is your chosen companion, you may put it into your hand from outside the game for as a sorcery.)

If a source you control with an odd mana value would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

Flash

Lifelink

When Obscura Interceptor enters the battlefield, it connives. When it connives this way, return up to one target spell to its owner's hand. (To have a creature connive, draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on that creature.)

When Obscura Storefront enters the battlefield, sacrifice it. When you do, search your library for a basic Plains, Island, or Swamp card, put it onto the battlefield tapped, then shuffle and you gain 1 life.

Bestow (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)

Vigilance

Enchanted creature gets +2/+2 and has vigilance.

Flying, ward

Whenever Obsessive Collector deals combat damage to a player, seek a card with mana value equal to the number of cards in your hand.

Protection from black

: Target creature gains protection from black until end of turn.

: Put a blaze counter on target land without a blaze counter on it. For as long as that land has a blaze counter on it, it has "At the beginning of your upkeep, this land deals 1 damage to you." (The land continues to burn after Obsidian Fireheart has left the battlefield.)

When Obstinate Baloth enters the battlefield, you gain 4 life.

If a spell or ability an opponent controls causes you to discard Obstinate Baloth, put it onto the battlefield instead of putting it into your graveyard.

Obstinate Gargoyle has flying as long as it's modified. (Equipment, Auras you control, and counters are modifications.)

Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Flash

Flying

Whenever another Faerie enters the battlefield under your control, each opponent loses 1 life.

When Obzedat, Ghost Council enters the battlefield, target opponent loses 2 life and you gain 2 life.

At the beginning of your end step, you may exile Obzedat. If you do, return it to the battlefield under its owner's control at the beginning of your next upkeep. It gains haste.

Draw X cards, then discard X cards. Create a 1/1 white Spirit creature token with flying for each card type among cards discarded this way.

This spell costs less to cast if you have eight or more instant and/or sorcery cards in your graveyard.

Ward

Magecraft — Whenever you cast or copy an instant or sorcery spell, target creature has base power and toughness 8/8 until end of turn.

When Octoprophet enters the battlefield, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

: Regenerate Odious Trow.

First strike (This creature deals combat damage before creatures without first strike.)

Whenever Odric, Master Tactician and at least three other creatures attack, you choose which creatures block this combat and how those creatures block.

When Odunos River Trawler enters the battlefield, return target enchantment creature card from your graveyard to your hand.

, Sacrifice Odunos River Trawler: Return target enchantment creature card from your graveyard to your hand.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)

I — Put a +1/+1 counter on up to one target creature. Create a Food token.

II — Draw a card. Create a Food token.

III — Create a 1/1 white Halfling creature token for each Food you control.

Disguise (You may cast this card face down for as a 2/2 creature with ward . Turn it face up any time for its disguise cost.)

When Offender at Large enters the battlefield or is turned face up, up to one target creature gets +2/+0 until end of turn.

Counter target spell unless its controller pays . You gain 4 life.

Haste

: Scry 1.

Haste

Whenever a creature you control with haste attacks, create a tapped Treasure token.

First strike

Whenever Ogre Battlecaster attacks, you may cast target instant or sorcery card from your graveyard by paying in addition to its other costs. If that spell would be put into a graveyard, exile it instead. When you cast that spell, Ogre Battlecaster gets +X/+0 until end of turn, where X is that spell's mana value.

Menace

Whenever Ogre Chitterlord enters the battlefield or attacks, create two 1/1 black Rat creature tokens with "This creature can't block." Then if you control five or more Rats, each Rat you control gets +2/+0 until end of turn.

When Ogre Gatecrasher enters the battlefield, destroy target creature with defender.

Defender

Attacking creatures you control have deathtouch.

Whenever a creature you control deals combat damage to a player, draw a card.

When Oil-Gorger Troll enters the battlefield, you gain 3 life. Then if you control a permanent with an oil counter on it, draw a card.

Trample

Whenever Ojer Kaslem deals combat damage to a player, reveal that many cards from the top of your library. You may put a creature card and/or a land card from among them onto the battlefield. Put the rest on the bottom in a random order.

When Ojer Kaslem dies, return it to the battlefield tapped and transformed under its owner's control.

Vigilance

If one or more creature tokens would be created under your control, three times that many of those tokens are created instead.

When Ojer Taq dies, return it to the battlefield tapped and transformed under its owner's control.

Whenever you cast a noncreature spell, choose one —

• Tap target creature.

• Ojutai Exemplars gains first strike and lifelink until end of turn.

• Exile Ojutai Exemplars, then return it to the battlefield tapped under its owner's control.

: Add or .

: Ojutai Monument becomes a 4/4 white and blue Dragon artifact creature with flying until end of turn.

Tap target creature. It doesn't untap during its controller's next untap step.

Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

Create a 2/2 blue Djinn Monk creature token with flying.

Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

Double strike, indestructible

Oketra the True can't attack or block unless you control at least three other creatures.

: Create a 1/1 white Warrior creature token with vigilance.

You may exert Oketra's Avenger as it attacks. When you do, prevent all combat damage that would be dealt to it this turn. (An exerted creature won't untap during your next untap step.)

White creature spells you cast cost less to cast.

Whenever you cast a creature spell, create a 1/1 white Warrior creature token with vigilance.

: Add .

, : Target legendary creature gets +1/+1 until end of turn.

+1: Put two +1/+1 counters on up to one target creature you control.

0: Until end of turn, Oko, the Trickster becomes a copy of target creature you control. Prevent all damage that would be dealt to him this turn.

−7: Until end of turn, each creature you control has base power and toughness 10/10 and gains trample.

Creatures you control have base power and toughness 3/3 until end of turn. You may search your library and/or graveyard for a card named Oko, the Trickster, reveal it, and put it into your hand. If you search your library this way, shuffle.

When Old Rutstein enters the battlefield and at the beginning of your upkeep, mill a card. If a land card is milled this way, create a Treasure token. If a creature card is milled this way, create a 1/1 green Insect creature token. If a noncreature, nonland card is milled this way, create a Blood token.

When Old-Growth Dryads enters the battlefield, each opponent may search their library for a basic land card, put it onto the battlefield tapped, then shuffle.

Trample

When Old-Growth Troll dies, if it was a creature, return it to the battlefield. It's an Aura enchantment with enchant Forest you control and "Enchanted Forest has ‘: Add ' and ‘, , Sacrifice this land: Create a tapped 4/4 green Troll Warrior creature token with trample.'"

Flying, lifelink

Whenever one or more outlaws you control deal combat damage to a player, create a Treasure token. (Assassins, Mercenaries, Pirates, Rogues, and Warlocks are outlaws.)

, Sacrifice two Treasures: Put two +1/+1 counters on each creature you control. Activate only as a sorcery.