As an additional cost to cast this spell, you may reveal a Dragon card from your hand.

Defender, flying

When Orator of Ojutai enters, if you revealed a Dragon card or controlled a Dragon as you cast this spell, draw a card.

, : 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.

: Add one mana of any color.

Other noncreature artifacts are mono and continuous. (Each activated ability of mono artifacts costs an additional to activate if its cost doesn't already include . As long as a continuous artifact is tapped, it loses all abilities.)

Reach (This creature can block creatures with flying.)

Whenever you cast a Spirit or Arcane spell, Orbweaver Kumo gains forestwalk until end of turn. (It can't be blocked as long as defending player controls a Forest.)

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.

Orchard Spirit can't be blocked except by creatures with flying or reach.

Whenever another Treefolk creature you control enters, you may gain life equal to that creature's toughness.

, Sacrifice a creature: Orcish Bloodpainter deals 1 damage to any target.

Orcish Cannonade deals 2 damage to any target and 3 damage to you.

Draw a card.

: Flip a coin. If you win the flip, target Orc creature gets +2/+0 until end of turn. If you lose the flip, it gets -0/-2 until end of turn.

, : Target creature can't be regenerated this turn.

, : Regenerate target black or green creature.

, : Regenerate target black or green creature.

, : Look at the top eight cards of your library. Exile four of them at random, then put the rest on top of your library in any order.

, Sacrifice an artifact: Orcish Mechanics deals 2 damage to any target.

When Orcish Paratroopers enters, flip it from a height of at least one foot. Sacrifice Orcish Paratroopers unless it turns over completely at least once during the flip and lands face up.

Whenever Orcish Squatters attacks and isn't blocked, you may gain control of target land defending player controls for as long as you control Orcish Squatters. If you do, Orcish Squatters assigns no combat damage this turn.

Orcish Veteran can't block white creatures with power 2 or greater.

: Orcish Veteran gains first strike until end of turn.

Enchant creature

Whenever enchanted creature attacks, put a +1/+1 counter on it. Then if it has three or more +1/+1 counters on it, sacrifice Ordeal of Erebos.

When you sacrifice Ordeal of Erebos, target player discards two cards.

Enchant creature

Whenever enchanted creature attacks, put a +1/+1 counter on it. Then if it has three or more +1/+1 counters on it, sacrifice this Aura.

When you sacrifice this Aura, search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle.

Enchant creature

Whenever enchanted creature attacks, put a +1/+1 counter on it. Then if it has three or more +1/+1 counters on it, sacrifice Ordeal of Thassa.

When you sacrifice Ordeal of Thassa, draw two cards.

Flying

Order of Midnight can't block.

Whenever Order of the Alabaster Host becomes blocked by a creature, that creature gets -1/-1 until end of turn.

Defender (This creature can't attack.)

As Order of the Stars enters, choose a color.

Order of the Stars has protection from the chosen color.

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.

Orderly Plaza enters tapped.

: Add or .

: Prevent the next 1 damage that would be dealt to Ordruun Commando this turn.

, Discard a card: Draw a card.

This spell costs less to cast for each land card in your graveyard.

Flying, haste

, Exile three cards from your graveyard: Target player loses 3 life.

When Organ Hoarder enters, look at the top three cards of your library, then put one of them into your hand and the rest into your graveyard.

: Prevent the next 3 damage that would be dealt to any target this turn.

Whenever one or more creatures attack you, you gain 1 life for each attacking creature.

: Prevent all damage that would be dealt to target creature this turn.

Grandeur — Discard another card named Oriss, Samite Guardian: Target player can't cast spells this turn, and creatures that player controls can't attack this turn.

Flying, trample, lifelink

Sacrifice another creature: Draw a card.

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

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Whenever Ornery Dilophosaur attacks, if you control a creature with power 4 or greater, Ornery Dilophosaur gets +2/+2 until end of turn.

Flying

Tribute 2 (As this creature enters, an opponent of your choice may put two +1/+1 counters on it.)

When Ornitharch enters, if tribute wasn't paid, create two 1/1 white Bird creature tokens with flying.

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

: Add one mana of any color.

Ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

Whenever one or more creatures you control deal combat damage to a player, create a Treasure token and manifest the top card of that player's library. (Put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Flying

Whenever Oros, the Avenger deals combat damage to a player, you may pay . If you do, Oros deals 3 damage to each nonwhite creature.

, : Create a token that's a copy of another target creature you control. It gains haste. Sacrifice it at the beginning of the next end step. Activate only as a sorcery.

, : Create five tokens that are copies of another target creature you control. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.

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.

This land enters tapped.

: Add or .

Whenever Orzhov Racketeers deals combat damage to a player, that player discards a card.

Afterlife 2 (When this creature dies, create two 1/1 white and black Spirit creature tokens with flying.)

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.

This spell costs less to cast for each different mana value among cards in your graveyard.

Whenever you discard a nonland card, you may cast it from your graveyard.