Gain life.
Spider-Man triggers, putting a +1/+1 counter on it.
Invisible Woman triggers, creating a 0/4 Wall creature token.
When the Wall enters, Aunt May triggers, causing you to gain life.
Repeat from step 2.

Infinite +1/+1 counters on certain creatures

Infinite ETB

Infinite creature tokens

Infinite lifegain

Infinite lifegain triggers

Invisible Woman, Sue Storm

Spider-Man, Peter Parker

Aunt May

Gain life.
Cleric Class triggers, putting a +1/+1 counter on the other Hero.
Invisible Woman triggers, creating a creature token.
When the creature token enters the battlefield, Soul Warden triggers, causing you to gain life.
Repeat from step 2.

Infinite +1/+1 counters on a creature

Hero Creature

Cleric Class

Soul Warden

Cause a Wall to enter under your control.
When the Wall enters, Bloodline Pretender triggers, putting a +1/+1 counter on it.
Invisible Woman triggers, creating a 0/4 Wall creature token with defender.
Repeat from step 2.

Bloodline Pretender

Activate Agent Phil Coulson by tapping it, putting a +1/+1 counter on each other Hero you control.
Invisible Woman triggers, creating a 0/4 Wall creature token with defender.
Activate Ashnod's Altar by sacrificing the Wall.
When the Wall dies, Agent Phil Coulson triggers, untapping Agent Phil Coulson.
Repeat.

Infinite LTB

Infinite colorless mana

Infinite death triggers

Infinite sacrifice triggers

Agent Phil Coulson

Thornbite Staff

Ashnod's Altar

Activate Extruder by sacrificing an artifact, putting a +1/+1 counter on the other Hero
Invisible Woman triggers, creating a creature token and an artifact token.
Repeat.

Extruder

Tippy-Toe, Terrific Partner

Put a +1/+1 counter on the other Hero.
Invisible Woman triggers, creating a creature token.
Activate Shilgengar by sacrificing the creature token.
When the creature token dies, Long Feng triggers, putting a +1/+1 counter on the other Hero.
Invisible Woman triggers, creating a creature token.
Resolve the Shilgengar ability.
Repeat from step 3.

Infinite Blood tokens

Long Feng, Grand Secretariat

Shilgengar, Sire of Famine

Combos with "Invisible Woman, Sue Storm"