Weight of the Underworld

Enchant creature
Enchanted creature gets -3/-2.

Returned Centaur

When Returned Centaur enters, target player mills four cards.

Enlightened Ascetic

When Enlightened Ascetic enters, you may destroy target enchantment.

Valor in Akros

Whenever a creature you control enters, creatures you control get +1/+1 until end of turn.

Knight of the Pilgrim's Road

Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)

Nantuko Husk

Sacrifice a creature: Nantuko Husk gets +2/+2 until end of turn.

Necromantic Summons

Put target creature card from a graveyard onto the battlefield under your control.
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, that creature enters with two additional +1/+1 counters on it.

Catacomb Slug

Deadbridge Shaman

When Deadbridge Shaman dies, target opponent discards a card.

Plains

Dark Dabbling

Regenerate target creature. Draw a card. (The next time the creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, also regenerate each other creature you control.

Unholy Hunger

Destroy target creature.
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, you gain 2 life.

Akroan Jailer

Touch of Moonglove

Target creature you control gets +1/+0 and gains deathtouch until end of turn. Whenever a creature dealt damage by that creature dies this turn, its controller loses 2 life. (Any amount of damage a creature with deathtouch deals to a creature is enough to destroy it.)

Aven Battle Priest

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Aven Battle Priest enters, you gain 3 life.

Nightsnare

Target opponent reveals their hand. You may choose a nonland card from it. If you do, that player discards that card. If you don't, that player discards two cards.

Yoked Ox

Auramancer

When Auramancer enters, you may return target enchantment card from your graveyard to your hand.

Rabid Bloodsucker

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Rabid Bloodsucker enters, each player loses 2 life.

Undead Servant

When Undead Servant enters, create a 2/2 black Zombie creature token for each card named Undead Servant in your graveyard.

Revenant

Flying
Revenant's power and toughness are each equal to the number of creature cards in your graveyard.

Macabre Waltz

Return up to two target creature cards from your graveyard to your hand, then discard a card.

Guardians of Meletis

Dark Petition

Search your library for a card, put that card into your hand, then shuffle.
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, add {B}{B}{B}.

Consecrated by Blood

Enchant creature
Enchanted creature gets +2/+2 and has flying and "Sacrifice two other creatures: Regenerate this creature." (The next time the creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Murder Investigation

Enchant creature you control
When enchanted creature dies, create X 1/1 white Soldier creature tokens, where X is its power.