Midvast Protector

When Midvast Protector enters, target creature you control gains protection from the color of your choice until end of turn.

Nearheath Stalker

Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

Hanweir Lancer

Soulbond (You may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them.)
As long as Hanweir Lancer is paired with another creature, both creatures have first strike.

Niblis of the Mist

Flying
When Niblis of the Mist enters, you may tap target creature.

Unruly Mob

Whenever another creature you control dies, put a +1/+1 counter on Unruly Mob.

Chapel Geist

Kessig Wolf

{1}{R}: Kessig Wolf gains first strike until end of turn.

Selfless Cathar

{1}{W}, Sacrifice Selfless Cathar: Creatures you control get +1/+1 until end of turn.

Talons of Falkenrath

Flash (You may cast this spell any time you could cast an instant.)
Enchant creature
Enchanted creature has "{1}{R}: This creature gets +2/+0 until end of turn."

Havengul Vampire

Whenever Havengul Vampire deals combat damage to a player, put a +1/+1 counter on it.
Whenever another creature dies, put a +1/+1 counter on Havengul Vampire.

Unhallowed Cathar

Loyal Cathar

Vigilance
When Loyal Cathar dies, return it to the battlefield transformed under your control at the beginning of the next end step.

Loyal Cathar // Unhallowed Cathar

Mountain

Forge Devil

When Forge Devil enters, it deals 1 damage to target creature and 1 damage to you.

Sanctuary Cat

Moonlight Geist

Flying
{3}{W}: Prevent all combat damage that would be dealt to and dealt by Moonlight Geist this turn.

Somberwald Vigilante

Whenever Somberwald Vigilante becomes blocked by a creature, Somberwald Vigilante deals 1 damage to that creature.

Kruin Striker

Whenever another creature you control enters, Kruin Striker gets +1/+0 and gains trample until end of turn. (It can deal excess combat damage to the player or planeswalker it's attacking.)

Call to Serve

Enchant nonblack creature
Enchanted creature gets +1/+2, has flying, and is an Angel in addition to its other types.

Torch Fiend

{R}, Sacrifice Torch Fiend: Destroy target artifact.

Plains

Faithless Looting

Draw two cards, then discard two cards.
Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Fling

As an additional cost to cast this spell, sacrifice a creature.
Fling deals damage equal to the sacrificed creature's power to any target.