At the beginning of your end step, each player may put two +1/+1 counters on a creature they control. Goad each creature that had counters put on it this way. (Until your next turn, those creatures attack each combat if able and attack a player other than you if able.)

{T}: Add one mana of any color.

{1}{G}: Create a 1/1 green Insect creature token.

{T}, Sacrifice a land: Destroy target land.

Trample, haste

Whenever Barbed Shocker deals damage to a player, that player discards all the cards in their hand, then draws that many cards.

{1}: Carrion Ants gets +1/+1 until end of turn.

At the beginning of each player's end step, Citadel of Pain deals X damage to that player, where X is the number of untapped lands they control.

{T}: Add {G}.

{1}{R}: Target creature can't block Duct Crawler this turn.

{T}: Fire Ants deals 1 damage to each other creature without flying.

Whenever a nontoken creature enters the battlefield, if Genesis Chamber is untapped, that creature's controller creates a 1/1 colorless Myr artifact creature token.

{T}: Add {B} or {G}.

{B}{G}: Golgari Keyrune becomes a 2/2 black and green Insect artifact creature with deathtouch until end of turn.

As long as Grist, the Hunger Tide isn't on the battlefield, it's a 1/1 Insect creature in addition to its other types.

+1: Create a 1/1 black and green Insect creature token, then mill a card. If an Insect card was milled this way, put a loyalty counter on Grist and repeat this process.

-2: You may sacrifice a creature. When you do, destroy target creature or planeswalker.

-5: Each opponent loses life equal to the number of creature cards in your graveyard.

Whenever a player taps a land for mana, that player adds one mana of any type that land produced.

Flying, vigilance

{T}: Add {R}.

Undergrowth -- When Izoni, Thousand-Eyed enters the battlefield, create a 1/1 black and green Insect creature token for each creature card in your graveyard.

{B}{G}, Sacrifice another creature: You gain 1 life and draw a card.

{T}: Add {B}.

Flying

Whenever a player sacrifices another permanent, put a +1/+1 counter on each creature you control.

{3}, {T}: Create a token that's a copy of Myr Propagator.

When Myr Retriever dies, return another target artifact card from your graveyard to your hand.

Imprint -- {T}: Exile target artifact card from a graveyard.

Myr Welder has all activated abilities of all cards exiled with it.

Myriad Landscape enters the battlefield tapped.

{T}: Add {C}.

{2}, {T}, Sacrifice Myriad Landscape: Search your library for up to two basic land cards that share a land type, put them onto the battlefield tapped, then shuffle.

When Old Rutstein enters the battlefield or at the beginning of your upkeep, mill a card. If a land card is milled this way, create a Treasure token. If a creature card is milled this way, create a 1/1 green Insect creature token. If a noncreature, nonland card is milled this way, create a Blood token.

Whenever a player taps a land for mana, that player adds one mana of any type that land produced, and Overabundance deals 1 damage to the player.

Enchant creature

At the beginning of your upkeep, enchanted creature's controller sacrifices it and you create a 1/1 colorless Phyrexian Myr artifact creature token.

When Perilous Myr dies, it deals 2 damage to any target.

Search your library for a basic land card, put it on the battlefield, then shuffle. Until end of turn, that land becomes a 4/3 Insect creature with reach and haste. It's still a land.

Release the Ants deals 1 damage to any target. Clash with an opponent. If you win, return Release the Ants to its owner's hand. (Each clashing player reveals the top card of their library, then puts that card on the top or bottom. A player wins if their card had a higher mana value.)

Create two 3/3 green Insect creature tokens. You gain 2 life.

Flashback {6}{G}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Whenever Saber Ants is dealt damage, you may create that many 1/1 green Insect creature tokens.

Whenever an opponent taps a land for mana, tap all lands that player controls.

If a creature an opponent controls attacks, all creatures that opponent controls attack if able.

Trample, haste

Cumulative upkeep {G}{G} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

Vigilance

A player losing unspent mana causes that player to lose that much life.

{1}, {T}: Each player adds {B}{R}{G}.

You may play lands and cast Insect spells from your graveyard.

Whenever another Insect you control dies, put it on the bottom of its owner's library, then mill two cards. (Put the top two cards of your library into your graveyard.)

{1}{B/G}: Target Insect gets +1/+0 and gains deathtouch until end of turn. ({B/G} can be paid with either {B} or {G}.)