Howling Banshee

Flying
When Howling Banshee enters, each player loses 3 life.

Crystal Ball

{1}, {T}: Scry 2. (Look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)

Call to Mind

Return target instant or sorcery card from your graveyard to your hand.

Wurm's Tooth

Whenever a player casts a green spell, you may gain 1 life.

Obstinate Baloth

When Obstinate Baloth enters, 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.

Whispersilk Cloak

Equipped creature can't be blocked and has shroud. (It can't be the target of spells or abilities.)
Equip {2}

Nature's Spiral

Return target permanent card from your graveyard to your hand.

White Knight

First strike (This creature deals combat damage before creatures without first strike.)
Protection from black (This creature can't be blocked, targeted, dealt damage, or enchanted by anything black.)

Black Knight

First strike (This creature deals combat damage before creatures without first strike.)
Protection from white (This creature can't be blocked, targeted, dealt damage, or enchanted by anything white.)

Chandra's Spitfire

Flying
Whenever an opponent is dealt noncombat damage, Chandra's Spitfire gets +3/+0 until end of turn.

Gargoyle Sentinel

Defender (This creature can't attack.)
{3}: Until end of turn, Gargoyle Sentinel loses defender and gains flying.

Ajani's Pridemate

Whenever you gain life, put a +1/+1 counter on this creature.

Flashfreeze

Water Servant

{U}: Water Servant gets +1/-1 until end of turn.
{U}: Water Servant gets -1/+1 until end of turn.

Celestial Purge

Dragon's Claw

Whenever a player casts a red spell, you may gain 1 life.

Hoarding Dragon

Flying
When this creature enters, you may search your library for an artifact card, exile it, then shuffle.
When this creature dies, you may put the exiled card into its owner's hand.

Rise from the Grave

Put target creature card from a graveyard onto the battlefield under your control. That creature is a black Zombie in addition to its other colors and types.

Voltaic Key

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Warlord's Axe

Equipped creature gets +3/+1.
Equip {4} ({4}: Attach to target creature you control. Equip only as a sorcery.)

Gravedigger

When Gravedigger enters, you may return target creature card from your graveyard to your hand.

Shiv's Embrace

Enchant creature
Enchanted creature gets +2/+2 and has flying.
{R}: Enchanted creature gets +1/+0 until end of turn.

Combust

This spell can't be countered.
Combust deals 5 damage to target white or blue creature. The damage can't be prevented.

Demon's Horn

Whenever a player casts a black spell, you may gain 1 life.

Ember Hauler

{1}, Sacrifice Ember Hauler: It deals 2 damage to any target.

Doom Blade

Mind Control

Enchant creature
You control enchanted creature.

Prized Unicorn

All creatures able to block Prized Unicorn do so.

Roc Egg

Defender (This creature can't attack.)
When Roc Egg dies, create a 3/3 white Bird creature token with flying.

Condemn

Put target attacking creature on the bottom of its owner's library. Its controller gains life equal to its toughness.

Earth Servant

Earth Servant gets +0/+1 for each Mountain you control.

Kraken's Eye

Whenever a player casts a blue spell, you may gain 1 life.

Elixir of Immortality

{2}, {T}: You gain 5 life. Shuffle Elixir of Immortality and your graveyard into their owner's library.

Alluring Siren

{T}: Target creature an opponent controls attacks you this turn if able.

Autumn's Veil

Spells you control can't be countered by blue or black spells this turn, and creatures you control can't be the targets of blue or black spells this turn.

Diabolic Tutor

Search your library for a card, put that card into your hand, then shuffle.

Serra Angel

Flying
Vigilance (Attacking doesn't cause this creature to tap.)

Deathmark

Relentless Rats

Relentless Rats gets +1/+1 for each other creature on the battlefield named Relentless Rats.
A deck can have any number of cards named Relentless Rats.

Cudgel Troll

{G}: Regenerate Cudgel Troll. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Prodigal Pyromancer

{T}: Prodigal Pyromancer deals 1 damage to any target.

Sorcerer's Strongbox

{2}, {T}: Flip a coin. If you win the flip, sacrifice Sorcerer's Strongbox and draw three cards.

War Priest of Thune

When War Priest of Thune enters, you may destroy target enchantment.

Air Servant

Flying
{2}{U}: Tap target creature with flying.

Sleep

Tap all creatures target player controls. Those creatures don't untap during that player's next untap step.

Garruk's Packleader

Whenever another creature you control with power 3 or greater enters, you may draw a card.

Corrupt

Corrupt deals damage to any target equal to the number of Swamps you control. You gain life equal to the damage dealt this way.

Back to Nature

Wall of Frost

Defender
Whenever Wall of Frost blocks a creature, that creature doesn't untap during its controller's next untap step.

Liliana's Caress

Whenever an opponent discards a card, that player loses 2 life.

Fire Servant

If a red instant or sorcery spell you control would deal damage, it deals double that damage instead.

Jace's Ingenuity

Awakener Druid

When Awakener Druid enters, target Forest becomes a 4/5 green Treefolk creature for as long as Awakener Druid remains on the battlefield. It's still a land.

Angel's Feather

Whenever a player casts a white spell, you may gain 1 life.

Armored Ascension

Enchant creature
Enchanted creature gets +1/+1 for each Plains you control and has flying.

Fireball

This spell costs {1} more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.

Acidic Slime

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
When Acidic Slime enters, destroy target artifact, enchantment, or land.