Dovescape

({W/U} can be paid with either {W} or {U}.)
Whenever a player casts a noncreature spell, counter that spell. That player creates X 1/1 white and blue Bird creature tokens with flying, where X is the spell's mana value.

Mana Flare

Whenever a player taps a land for mana, that player adds one mana of any type that land produced.

Aluren

Any player may cast creature spells with mana value 3 or less without paying their mana costs and as though they had flash.

Dual Nature

Whenever a nontoken creature enters, its controller creates a token that's a copy of that creature.
Whenever a nontoken creature leaves the battlefield, exile all tokens with the same name as that creature.
When Dual Nature leaves the battlefield, exile all tokens created with Dual Nature.

Aether Flash

Whenever a creature enters, Aether Flash deals 2 damage to it.

Glorious Anthem

Aetherflux Reservoir

Whenever you cast a spell, you gain 1 life for each spell you've cast this turn.
Pay 50 life: Aetherflux Reservoir deals 50 damage to any target.

Burgeoning

Whenever an opponent plays a land, you may put a land card from your hand onto the battlefield.

Fevered Visions

At the beginning of each player's end step, that player draws a card. If the player is your opponent and has four or more cards in hand, Fevered Visions deals 2 damage to that player.

Amulet of Safekeeping

Whenever you become the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays {1}.
Creature tokens get -1/-0.

Energy Flux

All artifacts have "At the beginning of your upkeep, sacrifice this artifact unless you pay {2}."

Wilderness Reclamation

At the beginning of your end step, untap all lands you control.

Dictate of Kruphix

Flash (You may cast this spell any time you could cast an instant.)
At the beginning of each player's draw step, that player draws an additional card.

Dictate of the Twin Gods

Flash
If a source would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

Authority of the Consuls

Creatures your opponents control enter tapped.
Whenever a creature an opponent controls enters, you gain 1 life.

Ankh of Mishra

Whenever a land enters, Ankh of Mishra deals 2 damage to that land's controller.

Well of Discovery

At the beginning of your end step, if you control no untapped lands, draw a card.

Arcane Melee

Instant and sorcery spells cost {2} less to cast.

Omniscience

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

Beast Whisperer

Whenever you cast a creature spell, draw a card.

Lodestone Golem

Nonartifact spells cost {1} more to cast.

Fecundity

Whenever a creature dies, that creature's controller may draw a card.

Cowardice

Whenever a creature becomes the target of a spell or ability, return that creature to its owner's hand. (It won't be affected by the spell or ability.)

Campaign of Vengeance

Whenever a creature you control attacks, defending player loses 1 life and you gain 1 life.

Eladamri's Vineyard

At the beginning of each player's first main phase, that player adds {G}{G}.

Forest

Sphinx's Tutelage

Whenever you draw a card, target opponent mills two cards. If two nonland cards that share a color were milled this way, repeat this process.
{5}{U}: Draw a card, then discard a card.

Null Rod

Activated abilities of artifacts can't be activated.

Thalia, Guardian of Thraben

First strike
Noncreature spells cost {1} more to cast.

Bloodbond March

Whenever a player casts a creature spell, each player returns all cards with the same name as that spell from their graveyard to the battlefield.

Endless Whispers

Each creature has "When this creature dies, choose target opponent. That player puts this card from its owner's graveyard onto the battlefield under their control at the beginning of the next end step."

Aether Barrier

Whenever a player casts a creature spell, that player sacrifices a permanent of their choice unless they pay {1}.

Death Pits of Rath

Whenever a creature is dealt damage, destroy it. It can't be regenerated.

Crucible of Worlds

Amulet of Vigor

Whenever a permanent you control enters tapped, untap it.

Vedalken Orrery

You may cast spells as though they had flash.

Citadel of Pain

At the beginning of each player's end step, Citadel of Pain deals X damage to that player, where X is the number of untapped lands they control.

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 lands from the top of your library.

Abzan Ascendancy

When Abzan Ascendancy enters, put a +1/+1 counter on each creature you control.
Whenever a nontoken creature you control dies, create a 1/1 white Spirit creature token with flying.

Consecrated Sphinx

Flying
Whenever an opponent draws a card, you may draw two cards.

Blood Moon

Phyrexian Arena

At the beginning of your upkeep, you draw a card and you lose 1 life.

Dueling Grounds

No more than one creature can attack each combat.
No more than one creature can block each combat.

Astral Drift

Whenever you cycle Astral Drift or cycle another card while Astral Drift is on the battlefield, you may exile target creature. If you do, return that card to the battlefield under its owner's control at the beginning of the next end step.
Cycling {2}{W} ({2}{W}, Discard this card: Draw a card.)

Barbed Foliage

Whenever a creature attacks you, it loses flanking until end of turn.
Whenever a creature without flying attacks you, Barbed Foliage deals 1 damage to it.