Core Prowler

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
When Core Prowler dies, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Caustic Hound

When Caustic Hound dies, each player loses 4 life.

Banewasp Affliction

Enchant creature
When enchanted creature dies, that creature’s controller loses life equal to its toughness.

Font of Mythos

At the beginning of each player’s draw step, that player draws two additional cards.

Boggart Ram-Gang

Haste
Wither (This deals damage to creatures in the form of -1/-1 counters.)

Dross Hopper

Sacrifice a creature: Dross Hopper gains flying until end of turn.

Glint Hawk

Flying
When Glint Hawk enters the battlefield, sacrifice it unless you return an artifact you control to its owner’s hand.

Glint Hawk Idol

Whenever another artifact enters the battlefield under your control, you may have Glint Hawk Idol become a 2/2 Bird artifact creature with flying until end of turn.
: Glint Hawk Idol becomes a 2/2 Bird artifact creature with flying until end of turn.

Trigon of Infestation

Trigon of Infestation enters the battlefield with three charge counters on it.
, : Put a charge counter on Trigon of Infestation.
, , Remove a charge counter from Trigon of Infestation: Create a 1/1 green Insect creature token with infect.

Corrupt

Corrupt deals damage to any target equal to the number of Swamps you control. You gain life equal to the damage dealt this way.

Cemetery Reaper

Other Zombie creatures you control get +1/+1.
, : Exile target creature card from a graveyard. Create a 2/2 black Zombie creature token.

Agony Warp

Target creature gets -3/-0 until end of turn.
Target creature gets -0/-3 until end of turn.

Qasali Pridemage

Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
, Sacrifice Qasali Pridemage: Destroy target artifact or enchantment.

Necrotic Sliver

All Slivers have “, Sacrifice this permanent: Destroy target permanent.”

Corrupt

Corrupt deals damage to any target equal to the number of Swamps you control. You gain life equal to the damage dealt this way.

Duergar Hedge-Mage

When Duergar Hedge-Mage enters the battlefield, if you control two or more Mountains, you may destroy target artifact.
When Duergar Hedge-Mage enters the battlefield, if you control two or more Plains, you may destroy target enchantment.

Rotting Rats

When Rotting Rats enters the battlefield, each player discards a card.
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.)

Cemetery Reaper

Other Zombie creatures you control get +1/+1.
, : Exile target creature card from a graveyard. Create a 2/2 black Zombie creature token.

Putrid Leech

Pay 2 life: Putrid Leech gets +2/+2 until end of turn. Activate this ability only once each turn.

Valley Rannet

Mountaincycling , forestcycling (, Discard this card: Search your library for a Mountain or Forest card, reveal it, put it into your hand, then shuffle your library.)