Common Cause

Nonartifact creatures get +2/+2 as long as they all share a color.

Delif's Cube

{2}, {T}: This turn, when target creature you control attacks and isn't blocked, it assigns no combat damage this turn and you put a cube counter on Delif's Cube.
{2}, Remove a cube counter from Delif's Cube: Regenerate target creature.

Soul Shepherd

{W}, Exile a creature card from your graveyard: You gain 1 life.

Reclusive Wight

At the beginning of your upkeep, if you control another nonland permanent, sacrifice Reclusive Wight.

Arcum's Sleigh

{2}, {T}: Target creature gains vigilance until end of turn. Activate only during combat and only if defending player controls a snow land.

Wood Elemental

As Wood Elemental enters, sacrifice any number of untapped Forests.
Wood Elemental's power and toughness are each equal to the number of Forests sacrificed as it entered.

Sheltering Prayers

Basic lands each player controls have shroud as long as that player controls three or fewer lands. (They can't be the targets of spells or abilities.)

Mage il-Vec

{T}, Discard a card at random: Mage il-Vec deals 1 damage to any target.

Juju Bubble

Cumulative upkeep {1} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
When you play a card, sacrifice Juju Bubble.
{2}: You gain 1 life.

Sorrow's Path

{T}: Choose two target blocking creatures controlled by the same opponent. If each of those creatures could block all creatures that the other is blocking, remove both of them from combat. Each one then blocks all creatures the other was blocking.
Whenever Sorrow's Path becomes tapped, it deals 2 damage to you and each creature you control.

Rakalite

{2}: Prevent the next 1 damage that would be dealt to any target this turn. Return Rakalite to its owner's hand at the beginning of the next end step.

Mogg Squad

Mogg Squad gets -1/-1 for each other creature on the battlefield.

Aysen Highway

White creatures have plainswalk. (They can't be blocked as long as defending player controls a Plains.)

Ertai's Trickery

Alabaster Leech

White spells you cast cost {W} more to cast.

Storm Elemental

Flying
{U}, Exile the top card of your library: Tap target creature with flying.
{U}, Exile the top card of your library: If the exiled card is a snow land, Storm Elemental gets +1/+1 until end of turn.

Thran War Machine

Echo {4} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
Thran War Machine attacks each combat if able.

Battlefield Percher

Flying
Battlefield Percher can block only creatures with flying.
{1}{B}: Battlefield Percher gets +1/+1 until end of turn.

Trip Wire

Destroy target creature with horsemanship.

Acidic Dagger

{4}, {T}: Whenever target creature deals combat damage to a non-Wall creature this turn, destroy that non-Wall creature. When the targeted creature leaves the battlefield this turn, sacrifice Acidic Dagger. Activate only before blockers are declared.

Jandor's Ring

{2}, {T}, Discard the last card you drew this turn: Draw a card.

Conservator

{3}, {T}: Prevent the next 2 damage that would be dealt to you this turn.

Vampiric Feast

Vampiric Feast deals 4 damage to any target and you gain 4 life.

Martyrs' Tomb

Pay 2 life: Prevent the next 1 damage that would be dealt to target creature this turn.

Volrath's Gardens

{2}, Tap an untapped creature you control: You gain 2 life. Activate only as a sorcery.

Jasmine Seer

{2}{W}, {T}: Reveal any number of white cards in your hand. You gain 2 life for each card revealed this way.

Bargain

Target opponent draws a card.
You gain 7 life.

Purelace

Target spell or permanent becomes white. (Mana symbols on that permanent remain unchanged.)