Activate Ashnod's Altar twice by sacrificing two creatures, adding {C}{C}{C}{C}.
The creatures die, triggering Soul Net twice.
Resolve the first trigger, choosing not to pay.
Resolve the second trigger, causing you to pay {1} to gain 1 life.
Trudge Garden triggers, causing you to pay {2} to create two 4/4 Fungus Beast creature tokens.
Repeat.

Infinite colorless mana

Infinite creature tokens

Infinite death triggers

Infinite creature ETB

Infinite lifegain

Infinite lifegain triggers

Infinite creature LTB

Infinite creature sacrifice triggers

Soul Net

Trudge Garden

Ashnod's Altar

Doubling Season

Parallel Lives

Activate Ashnod's Altar twice by sacrificing two creatures, adding {C}{C}{C}{C}.
The creatures die, triggering Soul Net twice.
Resolve the first trigger, choosing not to pay.
Resolve the second trigger, causing you to pay {1} to gain 1 life.
Trudge Garden triggers, causing you to pay {2} to create a 4/4 Fungus Beast and a 1/1 Squirrel creature token.
Repeat.

Chatterfang, Squirrel General

Primal Vigor

Anointed Procession

Adrix and Nev, Twincasters

Combos with "Soul Net"