Essence Warden

Whenever another creature enters, you gain 1 life.

Elvish Berserker

Whenever Elvish Berserker becomes blocked, it gets +1/+1 until end of turn for each creature blocking it.

Stormblood Berserker

Bloodthirst 2 (If an opponent was dealt damage this turn, this creature enters with two +1/+1 counters on it.)
Menace (This creature can't be blocked except by two or more creatures.)

Have

Cathartic Adept

Merfolk Mesmerist

Akrasan Squire

Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)

Viscera Seer

Sacrifice a creature: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Deathgreeter

Whenever another creature dies, you may gain 1 life.

Raging Goblin

Haste (This creature can attack and {T} as soon as it comes under your control.)

Crimson Mage

{R}: Target creature you control gains haste until end of turn. (It can attack and {T} this turn.)

Cloud Sprite

Flying (This creature can't be blocked except by creatures with flying or reach.)
Cloud Sprite can block only creatures with flying.

Pygmy Pyrosaur

Pygmy Pyrosaur can't block.
{R}: Pygmy Pyrosaur gets +1/+0 until end of turn.

Soulmender

Charging Badger

Infantry Veteran

{T}: Target attacking creature gets +1/+1 until end of turn.

Carrion Feeder

Carrion Feeder can't block.
Sacrifice a creature: Put a +1/+1 counter on Carrion Feeder.

Sage of Epityr

When Sage of Epityr enters, look at the top four cards of your library, then put them back in any order.

Merfolk of the Pearl Trident

Tundra Wolves

First strike (This creature deals combat damage before creatures without first strike.)

Goblin Piker

Fireslinger

{T}: Fireslinger deals 1 damage to any target and 1 damage to you.

Festering Goblin

When Festering Goblin dies, target creature gets -1/-1 until end of turn.

Merfolk Spy

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Whenever Merfolk Spy deals combat damage to a player, that player reveals a card at random from their hand.

Gladecover Scout

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

Elvish Mystic

Goblin Fireslinger

{T}: Goblin Fireslinger deals 1 damage to target player or planeswalker.

Zephyr Sprite

Typhoid Rats

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)