Whenever a player casts a spell, tap Ogre Recluse.

When Ogre Savant enters, if was spent to cast it, return target creature to its owner's hand.

, Discard a card at random: Ogre Shaman deals 2 damage to any target.

Whenever another nontoken creature dies, you may create a 1/1 black Rat creature token.

Rats you control have deathtouch.

Equipped creature gets +5/+0.

Equip

When Oil-Gorger Troll enters, 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.

Flying, trample

Whenever O-Kagachi, Vengeful Kami deals combat damage to a player, if that player attacked you during their last turn, exile target nonland permanent that player controls.

Return target creature or Vehicle card from your graveyard to the battlefield. Then put two +1/+1 counters on that permanent if you control an artifact and an enchantment.

As long as you have more cards in hand than each opponent, Okina Nightwatch gets +3/+3.

At the beginning of combat on your turn, Oko, the Ringleader becomes a copy of up to one target creature you control until end of turn, except he has hexproof.

+1: Draw two cards. If you've committed a crime this turn, discard a card. Otherwise, discard two cards.

−1: Create a 3/3 green Elk creature token.

−5: For each other nonland permanent you control, create a token that's a copy of that permanent.

Flying

At the beginning of each end step, if a creature died this turn, create a Food token. (It's an artifact with ", , Sacrifice this artifact: You gain 3 life.")

, Sacrifice another creature or artifact: Old Flitterfang gets +2/+2 until end of turn.

, : Tap target creature without reminder text. (Reminder text is still any italicized text in parentheses that explains rules you already know.)

When Old-Growth Dryads enters, 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.'"

Target creature gets -2/-2 until end of turn. If it's night, that creature gets -13/-13 until end of turn instead.

Each opponent exiles a creature with the greatest power among creatures that player controls.

Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, Olórin's Searing Light deals damage to each opponent equal to the power of the creature they exiled.

When Oltec Archaeologists enters, choose one —

• Return target artifact card from your graveyard to your hand.

• Scry 3. (Look at the top three cards of your library, then put any number of them on the bottom and the rest on top in any order.)

Omarthis, Ghostfire Initiate enters with X +1/+1 counters on it.

Whenever you put one or more +1/+1 counters on another colorless creature, you may put a +1/+1 counter on Omarthis.

When Omarthis dies, manifest a number of cards from the top of your library equal to the number of counters on it.

Flash

When Omen of the Forge enters, it deals 2 damage to any target.

, Sacrifice Omen of the Forge: Scry 2.

Landfall — Whenever a land you control enters, create a 5/5 red and green Elemental creature token.

Whenever Omnath, Locus of Rage or another Elemental you control dies, Omnath deals 3 damage to any target.

O-Naginata can be attached only to a creature with power 3 or greater.

Equipped creature gets +3/+0 and has trample.

Equip (: Attach to target creature you control. Equip only as a sorcery.)

Exile all permanents and all cards from all graveyards. Each player shuffles their hand into their library, then draws seven cards. Each player's life total becomes 10. Exile Once More with Feeling.

DCI ruling — A deck can have only one card named Once More with Feeling.

First strike

Landfall — Whenever a land you control enters, Ondu Greathorn gets +2/+2 until end of turn.

(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.

Flying

Whenever you draw a card, put a +1/+1 counter on Oneirophage.

Whenever you cast a creature spell, tap target creature.

: Target creature you control gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy it.)

Defender, flying

Wither (This deals damage to creatures in the form of -1/-1 counters.)

, Sacrifice a non-Ooze creature: Create an X/X green Ooze creature token, where X is the sacrificed creature's power. Activate only as a sorcery.

When you have 10 or less life, if Opal Avenger is an enchantment, Opal Avenger becomes a 3/5 Soldier creature.

When an opponent casts a creature spell, if Opal Guardian is an enchantment, Opal Guardian becomes a 3/4 Gargoyle creature with flying and protection from red.

Search your library for a basic land card or Gate card, reveal it, put it into your hand, then shuffle.

Add . You may open a sealed Magic booster pack. Until end of turn, you may cast spells from among the cards in that booster pack.

Flash

You control your opponents while they're searching their libraries.

While an opponent is searching their library, they exile each card they find. You may play those cards for as long as they remain exiled, and you may spend mana as though it were mana of any color to cast them.

When Oracle of Tragedy enters or dies, choose one —

• Draw a card, then discard a card.

• Shuffle up to four target cards with mana value 3 or greater from your graveyard into your library.

, : Add two mana in any combination of colors. Spend this mana only to cast Dragon spells or activate abilities of Dragons.

, , Sacrifice Orb of Dragonkind: Look at the top seven cards of your library. You may reveal a Dragon card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

You have hexproof. (You can't be the target of spells or abilities your opponents control.)

If a creature would deal damage to you, prevent 1 of that damage.

Trample

Whenever another creature dies, put a +1/+1 counter on Orca, Siege Demon.

When Orca dies, it deals damage equal to its power divided as you choose among any number of targets.

Flying

Order of Midnight can't block.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Whenever Order of Yawgmoth deals damage to a player, that player discards a card.

Whenever you cast a Spirit or Arcane spell, you may destroy target nonbasic land.

Inspired — Whenever Oreskos Sun Guide becomes untapped, you gain 2 life.

Your team may sacrifice any number of creatures. For each creature sacrificed this way, you add .

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for .)

Destroy all nonartifact creatures.

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

I — Origin of the Hidden Ones deals 4 damage to any target.

II — Create two 1/1 black Assassin creature tokens with menace.

III — Whenever an Assassin you control attacks this turn, create a 1/1 black Assassin creature token with menace that's tapped and attacking.

: Search your library for a card, put it into your graveyard, then shuffle. If it's an instant or sorcery card, put a +1/+1 counter on Oriq Loremage.

Untap target creature. It gets +1/+3 until end of turn.