Activate Ashnod's Altar by sacrificing another creature with power or toughness 1 or less, adding {C}{C}.
When the creature dies, Arnyn triggers, causing an opponent to lose 2 life and you to gain 2 life.
Trudge Garden triggers, causing you to pay {2} to create a 4/4 Beast creature token and a 1/1 Squirrel creature token due to Chatterfang.
Repeat.

Infinite creature ETB

Infinite creature LTB

Infinite colorless mana

Infinite creature tokens

Infinite death triggers

Infinite lifegain

Infinite lifegain triggers

Infinite lifeloss

Infinite creature sacrifice triggers

Arnyn, Deathbloom Botanist

Trudge Garden

Ashnod's Altar

Chatterfang, Squirrel General

Cast Viscera Seer by paying its mana cost.
Activate Viscera Seer by sacrificing it.
When Viscera Seer dies, Mortuary and Arnyn trigger.
Resolve the Mortuary trigger, putting Viscera Seer from your graveyard onto the top of your library.
Resolve the Arnyn trigger, causing target opponent to lose 2 life and you to gain 2 life.
Cast Viscera Seer from the top of your library by paying 1 life.
Repeat from step 2.

Infinite storm count

Mortuary

Bolas's Citadel

Viscera Seer

Activate Krark-Clan Ironworks by sacrificing a creature, adding {C}{C}.
When the creature dies, Arnyn triggers, causing you to gain 2 life and an opponent to lose 2 life.
Lisette triggers, causing you to pay {1} to put a +1/+1 counter on each creature you control.
Animation Module triggers for each counter placed this way.
Resolve the first trigger, choosing to pay {1} to create a 1/1 Servo artifact creature token.
Resolve all other triggers, choosing not to pay.
Repeat.

Infinite +1/+1 counters on creatures you control

Animation Module

Valentin, Dean of the Vein // Lisette, Dean of the Root

Krark-Clan Ironworks

Combos with "Arnyn, Deathbloom Botanist"