Spineseeker Centipede

When Spineseeker Centipede enters, search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Delirium — Spineseeker Centipede gets +1/+2 and has vigilance as long as there are four or more card types among cards in your graveyard.

Grisly Salvage

Reveal the top five cards of your library. You may put a creature or land card from among them into your hand. Put the rest into your graveyard.

Euru, Acorn Scrounger

When Euru, Acorn Scrounger enters, you may forage. When you do, conjure a card named Chitterspitter onto the battlefield.
Whenever one or more Squirrels you control deal combat damage to a player, you may sacrifice a token. If you do, put an acorn counter on each permanent you control named Chitterspitter.

Putrefying Rotboar

Lifelink
Whenever a Boar you control attacks, each nonland card in defending player’s hand perpetually gains “When you cast this spell, you lose 1 life.”

Grisly Salvage

Reveal the top five cards of your library. You may put a creature or land card from among them into your hand. Put the rest into your graveyard.

Stonehorn Dignitary

When Stonehorn Dignitary enters, target opponent skips their next combat phase.

Nightfire Giant

Nightfire Giant gets +1/+1 as long as you control a Mountain.
: Nightfire Giant deals 2 damage to any target.

Gruul War Chant

Attacking creatures you control get +1/+0 and have menace.

Rise from the Tides

Create a tapped 2/2 black Zombie creature token for each instant and sorcery card in your graveyard.

Slavering Nulls

Whenever Slavering Nulls deals combat damage to a player, if you control a Swamp, you may have that player discard a card.

Sword of the Squeak

Equipped creature gets +1/+1 for each creature you control with base power or toughness 1.
Whenever a Hamster, Mouse, Rat, or Squirrel you control enters, you may attach Sword of the Squeak to that creature.
Equip

Mercy Killing

Target creature’s controller sacrifices it, then creates X 1/1 green and white Elf Warrior creature tokens, where X is that creature’s power.

Rapid Augmenter

Haste
Whenever another creature you control with base power 1 enters, it gains haste until end of turn.
Whenever another creature you control enters, if it wasn’t cast, put a +1/+1 counter on Rapid Augmenter and Rapid Augmenter can’t be blocked this turn.

Sword of the Squeak

Equipped creature gets +1/+1 for each creature you control with base power or toughness 1.
Whenever a Hamster, Mouse, Rat, or Squirrel you control enters, you may attach Sword of the Squeak to that creature.
Equip

Mutagenic Growth

( can be paid with either or 2 life.)
Target creature gets +2/+2 until end of turn.

Thought Shucker

Threshold — : Put a +1/+1 counter on Thought Shucker and draw a card. Activate only if seven or more cards are in your graveyard and only once.

Lightning Mauler

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 haste.

Rapid Augmenter

Haste
Whenever another creature you control with base power 1 enters, it gains haste until end of turn.
Whenever another creature you control enters, if it wasn’t cast, put a +1/+1 counter on Rapid Augmenter and Rapid Augmenter can’t be blocked this turn.

Scourge Devil

When Scourge Devil enters, creatures you control get +1/+0 until end of turn.
Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Seasoned Warrenguard

Whenever Seasoned Warrenguard attacks while you control a token, Seasoned Warrenguard gets +2/+0 until end of turn.