Name: Oppressive Rays Cost: W Type: Enchantment -- Aura Rules Text: Enchant creature Enchanted creature can't attack or block unless its controller pays {3}. Activated abilities of enchanted creature cost {3} more to activate. Set/Rarity: Journey into Nyx common, Magic 2015 common Price: $0.06

Name: Optimistic Scavenger Cost: W Type: Creature -- Human Scout Pow/Tgh: 1/1 Rules Text: Eerie -- Whenever an enchantment you control enters and whenever you fully unlock a Room, put a +1/+1 counter on target creature. Set/Rarity: Duskmourn: House of Horror uncommon Price: $0.26

Name: Oracle en-Vec Cost: 1W Type: Creature -- Human Wizard Pow/Tgh: 1/1 Rules Text: {T}: Target opponent chooses any number of creatures they control. During that player's next turn, the chosen creatures attack if able, and other creatures can't attack. At the beginning of that turn's end step, destroy each of the chosen creatures that didn't attack this turn. Activate only during your turn. Set/Rarity: Tempest rare Price: $0.64

Name: Oracle's Attendants Cost: 3W Type: Creature -- Human Soldier Pow/Tgh: 1/5 Rules Text: {T}: All damage that would be dealt to target creature this turn by a source of your choice is dealt to this creature instead. Set/Rarity: Nemesis rare, Eighth Edition rare, Ninth Edition rare Price: $0.14

Name: Oracle's Vault Cost: 4 Type: Artifact Rules Text: {2}, {T}: Exile the top card of your library. Until end of turn, you may play that card. Put a brick counter on this artifact. {T}: Exile the top card of your library. Until end of turn, you may play that card without paying its mana cost. Activate only if there are three or more brick counters on this artifact. Set/Rarity: Magic Online Promos rare, Amonkhet Promos rare, Amonkhet rare, New Capenna Commander rare Price: $0.15

Name: Orah, Skyclave Hierophant Cost: 2WB Type: Legendary Creature -- Kor Cleric Pow/Tgh: 3/3 Rules Text: Lifelink Whenever Orah or another Cleric you control dies, return target Cleric card with lesser mana value from your graveyard to the battlefield. Set/Rarity: Magic Online Promos rare, Zendikar Rising Promos rare, Zendikar Rising rare Price: $0.22

Name: Orator of Ojutai Cost: 1W Type: Creature -- Bird Monk Pow/Tgh: 0/4 Rules Text: As an additional cost to cast this spell, you may reveal a Dragon card from your hand. Defender, flying When this creature enters, if you revealed a Dragon card or controlled a Dragon as you cast this spell, draw a card. Set/Rarity: Magic Online Promos uncommon, Friday Night Magic 2015 rare, Dragons of Tarkir uncommon, Commander 2017 uncommon Price: $0.14

Name: Orazca Relic Cost: 3 Type: Artifact Rules Text: Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.) {T}: Add {C}. {T}, Sacrifice this artifact: You gain 3 life and draw a card. Activate only if you have the city's blessing. Set/Rarity: Rivals of Ixalan common, Forgotten Realms Commander common Price: $0.09

Name: Orb of Dreams Cost: 3 Type: Artifact Rules Text: Permanents enter tapped. Set/Rarity: Betrayers of Kamigawa rare Price: $2.76

Name: Orbs of Warding Cost: 5 Type: Artifact Rules Text: 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. Set/Rarity: Magic Origins rare Price: $0.54

Name: Orc Sureshot Cost: 3B Type: Creature -- Orc Archer Pow/Tgh: 4/2 Rules Text: Whenever another creature you control enters, target creature an opponent controls gets -1/-1 until end of turn. Set/Rarity: Fate Reforged uncommon, The List uncommon Price: $0.17

Name: Orcish Bowmasters Cost: 1B Type: Creature -- Orc Archer Pow/Tgh: 1/1 Rules Text: Flash When this creature enters and whenever an opponent draws a card except the first one they draw in each of their draw steps, this creature deals 1 damage to any target. Then amass Orcs 1. Set/Rarity: The Lord of the Rings: Tales of Middle-earth rare, Tales of Middle-earth Promos rare Price: $46.19

Name: Orcish Medicine Cost: 1B Type: Instant Rules Text: Target creature gains your choice of lifelink or indestructible until end of turn. Amass Orcs 1. (Put a +1/+1 counter on an Army you control. It's also an Orc. If you don't control an Army, create a 0/0 black Orc Army creature token first.) Set/Rarity: The Lord of the Rings: Tales of Middle-earth common Price: $0.23

Name: Ordeal of Erebos Cost: 1B Type: Enchantment -- Aura Rules Text: 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, target player discards two cards. Set/Rarity: Theros uncommon Price: $0.10

Name: Ordeal of Heliod Cost: 1W Type: Enchantment -- Aura Rules Text: 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, you gain 10 life. Set/Rarity: Theros uncommon, Masters 25 uncommon Price: $0.14

Name: Order of Leitbur Cost: WW Type: Creature -- Human Cleric Knight Pow/Tgh: 2/1 Rules Text: Protection from black {W}: This creature gains first strike until end of turn. {W}{W}: This creature gets +1/+0 until end of turn. Set/Rarity: Fallen Empires common, Pro Tour Collector Set common, Masters Edition common Price: $0.18

Name: Order of Midnight Cost: 1B Type: Creature -- Human Knight Pow/Tgh: 2/2 Rules Text: Flying This creature can't block. [Related to Alter Fate.] Set/Rarity: Magic Online Promos uncommon, Throne of Eldraine uncommon, The List uncommon, March of the Machine Commander uncommon Price: $0.12

Name: Order of Sacred Dusk Cost: 6WB Type: Creature -- Vampire Knight Pow/Tgh: 5/5 Rules Text: Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) Flying, lifelink, haste Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.) Other Vampires you control have exalted. Set/Rarity: The Lost Caverns of Ixalan Commander rare Price: $0.28

Name: Order of Whiteclay Cost: 1WW Type: Creature -- Kithkin Cleric Pow/Tgh: 1/4 Rules Text: {1}{W}{W}, {Q}: Return target creature card with mana value 3 or less from your graveyard to the battlefield. ({Q} is the untap symbol.) Set/Rarity: Shadowmoor rare, Commander Legends: Battle for Baldur's Gate rare Price: $0.34

Name: Order of Yawgmoth Cost: 2BB Type: Creature -- Phyrexian Zombie Knight Pow/Tgh: 2/2 Rules Text: Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) Whenever this creature deals damage to a player, that player discards a card. Set/Rarity: Urza's Saga uncommon, Duel Decks: Phyrexia vs. the Coalition uncommon, The List uncommon Price: $0.12