+Infest (16)
Whenever a creature dies, if it had a -1/-1 counter on it, put a -1/-1 counter on target creature.
At the beginning of your upkeep, you may mill two cards. (You may put the top two cards of your library into your graveyard.)
Whenever one or more creature cards are put into your graveyard from anywhere during your turn, create a 1/1 green Insect creature token. This ability triggers only once each turn.
Enchant artifact
At the beginning of your end step, Gremlin Infestation deals 2 damage to enchanted artifact's controller.
When enchanted artifact is put into a graveyard, create a 2/2 red Gremlin creature token.
All creatures get -2/-2 until end of turn.
Whenever Infestation Expert enters the battlefield or attacks, create a 1/1 green Insect creature token.
Daybound (If a player casts no spells during their own turn, it becomes night next turn.)
Equipped creature gets +2/+0.
Whenever equipped creature attacks, create a 1/1 colorless Phyrexian Mite artifact creature token with toxic 1 and "This creature can't block." (Players dealt combat damage by it also get a poison counter.)
Equip
Defender (This creature can't attack.)
Protection from artifacts
Whenever an opponent casts an artifact spell, you may create a 1/1 green Insect creature token.
Whenever Infested Werewolf enters the battlefield or attacks, create two 1/1 green Insect creature tokens.
Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)
Flying
Infesting Radroach can't block.
Whenever Infesting Radroach deals combat damage to a player, they get that many rad counters.
Whenever an opponent mills a nonland card, if Infesting Radroach is in your graveyard, you may return it to your hand.
Destroy all creatures target player controls. For each creature that died this way, that player creates two 1/1 red Goblin creature tokens.
Destroy up to X target artifacts and/or enchantments. Create twice X 1/1 black and green Pest creature tokens with "When this creature dies, you gain 1 life."
Whenever a player kicks a spell, you create a 1/1 green Saproling creature token.
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 Phyrexian Insect creature token with infect.
Enchant nonbasic land
When enchanted land becomes tapped, destroy it.
, Remove a counter from another permanent you control: Populate. Activate only as a sorcery. (Create a token that's a copy of a creature token you control.)
, Sacrifice another creature: Proliferate. Activate only as a sorcery. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
Discard two cards: Create a 2/2 black Zombie creature token.
Gatherer works better in the Companion app!