Niblis of the Mist

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

Slayer of the Wicked

When Slayer of the Wicked enters the battlefield, you may destroy target Vampire, Werewolf, or Zombie.

Doomed Traveler

When Doomed Traveler dies, create a 1/1 white Spirit creature token with flying.

Hollowhenge Spirit

Flash (You may cast this spell any time you could cast an instant.)
Flying
When Hollowhenge Spirit enters the battlefield, remove target attacking or blocking creature from combat.

Briarpack Alpha

Flash (You may cast this spell any time you could cast an instant.)
When Briarpack Alpha enters the battlefield, target creature gets +2/+2 until end of turn.

Siege Mastodon

Mentor of the Meek

Whenever another creature with power 2 or less enters the battlefield under your control, you may pay {1}. If you do, draw a card.

Krallenhorde Wantons

At the beginning of each upkeep, if a player cast two or more spells last turn, transform Krallenhorde Wantons.

Grizzled Outcasts

At the beginning of each upkeep, if no spells were cast last turn, transform Grizzled Outcasts.

Grizzled Outcasts // Krallenhorde Wantons

Break of Day

Creatures you control get +1/+1 until end of turn.
Fateful hour — If you have 5 or less life, those creatures gain indestructible until end of turn. (Damage and effects that say "destroy" don't destroy them.)

Forest

Lurking Crocodile

Bloodthirst 1 (If an opponent was dealt damage this turn, this creature enters the battlefield with a +1/+1 counter on it.)
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Strangleroot Geist

Haste
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.)

Hunger of the Howlpack

Put a +1/+1 counter on target creature.
Morbid — Put three +1/+1 counters on that creature instead if a creature died this turn.

Trollhide

Enchant creature
Enchanted creature gets +2/+2 and has "{1}{G}: Regenerate this creature." (The next time the creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.)

Avacynian Priest

Ambush Viper

Plains

Armored Warhorse

Selfless Cathar

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

Runechanter's Pike

Equipped creature has first strike and gets +X/+0, where X is the number of instant and sorcery cards in your graveyard.
Equip {2}

Rebuke

Sacred Wolf

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Pacifism

Enchant creature
Enchanted creature can't attack or block.

Howlpack of Estwald

At the beginning of each upkeep, if a player cast two or more spells last turn, transform Howlpack of Estwald.

Villagers of Estwald

At the beginning of each upkeep, if no spells were cast last turn, transform Villagers of Estwald.