Painful Truths
Casting Cost:
Converge — You draw X cards and you lose X life, where X is the number of colors of mana spent to cast Painful Truths.
$ 000
Painful Quandary
Whenever an opponent casts a spell, that player loses 5 life unless he or she discards a card.
Pact of Negation
Counter target spell.
At the beginning of your next upkeep, pay . If you don't, you lose the game.
Overgrown Tomb
(: Add or to your mana pool.)
As Overgrown Tomb enters the battlefield, you may pay 2 life. If you don't, Overgrown Tomb enters the battlefield tapped.
Overburden
Whenever a player puts a nontoken creature onto the battlefield, that player returns a land he or she controls to its owner's hand.
Orzhov Pontiff
Haunt (When this creature dies, exile it haunting target creature.)
When Orzhov Pontiff enters the battlefield or the creature it haunts dies, choose one —
• Creatures you control get +1/+1 until end of turn.• Creatures you don't control get -1/-1 until end of turn.
Order of Whiteclay
, : Return target creature card with converted mana cost 3 or less from your graveyard to the battlefield. ( is the untap symbol.)
Oracle of Mul Daya
You may play an additional land on each of your turns.
Play with the top card of your library revealed.
You may play the top card of your library if it's a land card.
Opposition
Tap an untapped creature you control: Tap target artifact, creature, or land.
Oona's Prowler
Flying
Discard a card: Oona's Prowler gets -2/-0 until end of turn. Any player may activate this ability.
Omniscience
You may cast nonland cards from your hand without paying their mana costs.
Omnath, Locus of Mana
Green mana doesn't empty from your mana pool as steps and phases end.
Omnath, Locus of Mana gets +1/+1 for each green mana in your mana pool.
Olivia, Mobilized for War
Whenever another creature enters the battlefield under your control, you may discard a card. If you do, put a +1/+1 counter on that creature, it gains haste until end of turn, and it becomes a Vampire in addition to its other types.
Olivia Voldaren
: Olivia Voldaren deals 1 damage to another target creature. That creature becomes a Vampire in addition to its other types. Put a +1/+1 counter on Olivia Voldaren.
: Gain control of target Vampire for as long as you control Olivia Voldaren.
Obstinate Baloth
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.
Oboro, Palace in the Clouds
: Add to your mana pool.
: Return Oboro, Palace in the Clouds to its owner's hand.
Oblivion Sower (Prerelease Foil)
When you cast Oblivion Sower, target opponent exiles the top four cards of his or her library, then you may put any number of land cards that player owns from exile onto the battlefield under your control.