Whenever a creature dies, if it had a -1/-1 counter on it, put a -1/-1 counter on target creature.

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.

Whenever Infestation Expert enters 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

Flash

When Infested Thrinax enters, until end of turn, whenever a nontoken creature you control dies, create a number of 1/1 green Saproling creature tokens equal to that creature's power.

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 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."

Trigon of Infestation enters 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.

, 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.)