Forge Devil

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

Torch Fiend

{R}, Sacrifice this creature: Destroy target artifact.

Call to Serve

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

Kruin Striker

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

Mountain

Moonlight Geist

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

Sanctuary Cat

Niblis of the Mist

Flying
When this creature enters, you may tap target creature.

Selfless Cathar

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

Plains

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.)

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.

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.)

Unhallowed Cathar

Loyal Cathar

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

Loyal Cathar // Unhallowed Cathar

Unruly Mob

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

Havengul Vampire

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

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 this creature is paired with another creature, both creatures have first strike.

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."

Kessig Wolf

{1}{R}: This creature gains first strike until end of turn.

Midvast Protector

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

Chapel Geist

Somberwald Vigilante

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