Activate Phyrexian Altar by sacrificing Body Launderer, adding {G}.
When Body Launderer dies, its second ability triggers, returning Grist, Voracious Larva from your graveyard to the battlefield.
When Grist, Voracious Larva enters the battlefield, it triggers, causing you to pay {G} to exile it and return it to the battlefield as Grist, the Plague Swarm with six loyalty counters due to Vorinclex.
Activate Grist, the Plague Swarm's third loyalty ability by removing six loyalty counters from it.
Grist, the Plague Swarm is put into your graveyard as a state-based action due to having zero loyalty.
Resolve the Grist, the Plague Swarm ability, creating a token copy of each creature card in your graveyard that is a 1/1 Insect.
When the Grist, Voracious Larva token enters the battlefield, it triggers for each token created this way. Choose not to pay for any of the triggers.
Activate Phyrexian Altar by sacrificing the Grist, Voracious Larva token, adding one mana of any color.
Repeat from step 1, sacrificing a Body Launderer token instead.

Infinite creature LTB

Infinite creature ETB

Infinite colored mana

Infinite creature sacrifice triggers

Infinite death triggers

Infinite creature tokens

Infinite copies of creature cards in your graveyard that are 1/1 Insects

Grist, Voracious Larva // Grist, the Plague Swarm

Vorinclex, Monstrous Raider

Body Launderer

Phyrexian Altar

Activate Phyrexian Altar by sacrificing Body Launderer, adding {G}.
When Body Launderer dies, its second ability triggers, returning Grist, Voracious Larva from your graveyard to the battlefield.
When Grist, Voracious Larva enters the battlefield, it triggers, causing you to pay {G} to exile it and return it to the battlefield as Grist, the Plague Swarm with six loyalty counters due to Doubling Season.
Activate Grist, the Plague Swarm's third loyalty ability by removing six loyalty counters from it.
Grist, the Plague Swarm is put into your graveyard as a state-based action due to having zero loyalty.
Resolve the Grist, the Plague Swarm ability, creating two token copies of each creature card in your graveyard that is a 1/1 Insect.
Put all but one Grist, Voracious Larva token into your graveyard due to the legend rule.
When the Grist, Voracious Larva tokens enters the battlefield, they each trigger for each token created this way. Choose not to pay for any of the triggers.
Activate Phyrexian Altar by sacrificing the Grist, Voracious Larva token, adding one mana of any color.
Repeat from step 1, sacrificing a Body Launderer token instead.

Doubling Season

Activate Carrion Feeder by sacrificing Body Launderer.
When Body Launderer dies, its second ability triggers, returning Grist, Voracious Larva from your graveyard to the battlefield.
When Grist, Voracious Larva enters the battlefield, it triggers, causing you to pay {G} to exile it and return it to the battlefield as Grist, the Plague Swarm with six loyalty counters due to Vorinclex.
Resolve the Carrion Feeder ability, putting a +1/+1 counter on it.
Activate Grist, the Plague Swarm's third loyalty ability by removing six loyalty counters from it.
Grist, the Plague Swarm is put into your graveyard as a state-based action due to having zero loyalty.
Resolve the Grist, the Plague Swarm ability, creating a token copy of each creature card in your graveyard that is a 1/1 Insect.
When the Grist, Voracious Larva and Hidden Herbalist tokens enter the battlefield, the Hidden Herbalist token triggers once and the Grist, Voracious Larva token triggers for each token created this way.
Resolve all Grist, Voracious Larva triggers, choosing not to pay.
Resolve the Hidden Herbalist trigger, adding {G}{G}.
Activate Carrion Feeder by sacrificing the Grist, Voracious Larva token, putting a +1/+1 counter on Carrion Feeder.
Repeat from step 1, sacrificing a Body Launderer token instead.

Infinite green mana

Infinite +1/+1 counters on a creature

Hidden Herbalists

Carrion Feeder

Activate Mirage Mirror by paying {2}, causing it to become a copy of Myth Unbound until end of turn.
Activate Phyrexian Altar by sacrificing Grist, adding {G}.
Choose to return Grist to the command zone from your graveyard.
Myth Unbound and Mirage Mirror trigger, causing you to draw two cards.
Cast Grist from the command zone by paying {G}.
Repeat from step 2.

Infinite card draw

Near-infinite creature ETB

Infinite draw triggers

Near-infinite storm count

Near-infinite creature LTB

Near-infinite death triggers

Near-infinite creature sacrifice triggers

Near-infinite commander casts

Myth Unbound

Mirage Mirror

Activate Bloodthrone Vampire by sacrificing Body Launderer.
When Body Launderer dies, its second ability triggers, returning Grist, Voracious Larva from your graveyard to the battlefield.
When Grist, Voracious Larva enters the battlefield, it triggers, causing you to pay {G} to exile it and return it to the battlefield as Grist, the Plague Swarm with six loyalty counters due to Doubling Season.
Resolve the Bloodthrone Vampire ability
Activate Grist, the Plague Swarm's third loyalty ability by removing six loyalty counters from it.
Grist, the Plague Swarm is put into your graveyard as a state-based action due to having zero loyalty.
Resolve the Grist, the Plague Swarm ability, creating two token copies of each creature card in your graveyard that are 1/1 Insects.
Put all but one of the Grist, Voracious Larva tokens into your graveyard due to the legend rule.
When the Grist, Voracious Larva and Hidden Herbalist tokens enter the battlefield, each Hidden Herbalist token triggers once and each Grist, Voracious Larva token triggers for each token created this way.
Resolve all Grist, Voracious Larva triggers, choosing not to pay.
Resolve both Hidden Herbalist triggers, adding {G}{G}{G}{G}.
Activate Bloodthrone Vampire by sacrificing the Grist, Voracious Larva token
Repeat from step 1, sacrificing a Body Launderer token instead.

Infinitely large creature until end of turn

Bloodthrone Vampire

Combos with "Grist, Voracious Larva // Grist, the Plague Swarm"