Flying

Olivia's Bloodsworn can't block.

: Target Vampire gains haste until end of turn.

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

Trample

Olog-hai Crusher can't block unless you control a Goblin or Orc.

At the beginning of your upkeep, you gain 2 life.

Whenever you gain life, you may pay . If you do, draw a card and each opponent loses 1 life.

At the beginning of your upkeep, if Oloro, Ageless Ascetic is in the command zone, you gain 2 life.

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.

Return all Islands to their owners' hands. Each player sacrifices a Plains or a white permanent for each white permanent they control.

: Add .

, , Exile Ominous Cemetery: Target creature's owner shuffles it into their library.

When Ominous Roost enters and whenever you cast a spell from your graveyard, create a 1/1 blue Bird creature token with flying and "This creature can block only creatures with flying."

Flying

Whenever you cycle or discard a card, target creature an opponent controls gets -2/-0 until end of turn.

When Omnath, Locus of Creation enters, draw a card.

Landfall — Whenever a land you control enters, you gain 4 life if this is the first time this ability has resolved this turn. If it's the second time, add . If it's the third time, Omnath deals 4 damage to each opponent and each planeswalker you don't control.

: Target creature becomes a Frog with base power and toughness 3/3 until end of turn.

You may cast spells from your hand without paying their mana costs.

Delirium — Whenever Omnivorous Flytrap enters or attacks, if there are four or more card types among cards in your graveyard, distribute two +1/+1 counters among one or two target creatures. Then if there are six or more card types among cards in your graveyard, double the number of +1/+1 counters on those creatures.

Enchant creature

Enchanted creature is legendary, gets +1/+1, and has flying, vigilance, and lifelink.

Enchant snow land you control

When On Thin Ice enters, exile target creature an opponent controls until On Thin Ice leaves the battlefield.

Reach

: Onakke Javelineer deals 2 damage to target player or battle.

If this spell is the first spell you've cast this game, you may cast it without paying its mana cost.

Look at the top five cards of your library. You may reveal a creature or land card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

Whenever Ondu Cleric or another Ally you control enters, you may gain life equal to the number of Allies you control.

Destroy all nonland permanents.

Whenever a creature attacks this turn, it gains lifelink until end of turn.

Awaken 4— (If you cast this spell for , also put four +1/+1 counters on target land you control and it becomes a 0/0 Elemental creature with haste. It's still a land.)

Whenever an enchantment you control enters, you may create a token that's a copy of it. Do this only once each 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.

Enchant creature

Whenever enchanted creature deals combat damage to a player, you may search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Flash

Enchant creature you control

Whenever enchanted creature or another modified creature you control dies, create X 1/1 colorless Spirit creature tokens, where X is that creature's power. (Equipment, Auras you control, and counters are modifications.)

You may look at the top card of your library any time.

You may play lands and cast spells from the top of your library.

Once during each of your turns, you may cast a spell from your hand or the top of your library without paying its mana cost.

Enchant creature

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

Whenever one or more creatures you control deal combat damage to a player, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

, Exile a creature card from your graveyard: Investigate. You gain 2 life.

Enchant creature

At the beginning of your upkeep, sacrifice a creature.

Enchanted creature gets +3/+3 and has trample.

Enchanted creature is a Demon Spirit.

Target creature gets +X/+0 until end of turn, where X is its power.

Whenever an opponent casts a creature spell, if Opal Acrolith is an enchantment, Opal Acrolith becomes a 2/4 Soldier creature.

: Opal Acrolith becomes an enchantment.

When an opponent casts a creature spell, if Opal Champion is an enchantment, Opal Champion becomes a 3/3 Knight creature with first strike.

When an opponent casts a creature spell, if Opal Titan is an enchantment, Opal Titan becomes a 4/4 Giant creature with protection from each of that spell's colors.

Sunburst (This enters with a charge counter on it for each color of mana spent to cast it.)

Equipped creature gets +X/+X, where X is the number of charge counters on Opaline Bracers.

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

: Add one mana of any color.

X target creatures can't be blocked this turn. Until end of turn, those creatures gain "Whenever this creature deals combat damage to a player, draw a card."

Whenever Ophidian attacks and isn't blocked, you may draw a card. If you do, Ophidian assigns no combat damage this turn.

At the beginning of each upkeep, if you control no Snakes, create a 1/1 black Snake creature token with deathtouch.

Flying

When Opportunistic Dragon enters, choose target Human or artifact an opponent controls. For as long as Opportunistic Dragon remains on the battlefield, gain control of that permanent, it loses all abilities, and it can't attack or block.

Tap an untapped creature you control: Tap target artifact, creature, or land.

Whenever a player casts a spell, that player discards a card.

Counter target spell unless its controller pays for each card in your hand.

Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, put a +1/+1 counter on target creature.

More Than Meets the Eye (You may cast this card converted for .)

At the beginning of each end step, bolster 1. (Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.)

When Optimus Prime dies, return it to the battlefield converted under its owner's control.

Lifelink

Whenever Orah, Skyclave Hierophant or another Cleric you control dies, return target Cleric card with lesser mana value from your graveyard to the battlefield.

: Oran-Rief Invoker gets +5/+5 and gains trample until end of turn.

Kicker (You may pay an additional as you cast this spell.)

Reach (This creature can block creatures with flying.)

When Oran-Rief Recluse enters, if it was kicked, destroy target creature with flying.

Oran-Rief, the Vastwood enters tapped.

: Add .

: Put a +1/+1 counter on each green creature that entered this turn.

Protection from red

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)

: Add .

, Sacrifice Orazca Relic: You gain 3 life and draw a card. Activate only if you have the city's blessing.

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.