Activate Heliod by paying {1}{W}, giving Casey lifelink.
Gain life.
Heliod triggers, putting a +1/+1 counter on Casey.
Casey triggers, dealing 1 damage to an opponent and causing you to gain 1 life due to its lifelink.
Repeat from step 3.

Infinite +1/+1 counters on a creature

Infinite damage

Infinite lifegain

Infinite lifegain triggers

Casey Jones, Back Alley Brute

Heliod, Sun-Crowned

Gain life.
Archangel of Thune triggers, putting a +1/+1 counter on each creature you control.
Casey triggers, dealing damage to an opponent and causing you to gain that much life due to its lifelink.
Repeat from step 2.

Infinite +1/+1 counters on creatures you control

Archangel of Thune

Gain life.
Heroic Feast triggers, putting a +1/+1 counter on Casey.
Casey triggers, dealing 1 damage to an opponent and causing you to gain 1 life due to its lifelink.
Repeat from step 2.

Heroic Feast

Gain life.
Cleric Class triggers, putting a +1/+1 counter on Casey.
Casey triggers, dealing 1 damage to an opponent and causing you to gain 2 life due to its lifelink and Cleric Class
Repeat from step 2.

Cleric Class

Gain life.
The Destined White Mage triggers, putting a +1/+1 counter on Casey.
Casey triggers, dealing 1 damage to an opponent and causing you to gain 1 life due to its lifelink.
Repeat from step 2.

The Destined White Mage

Gain life.
Casey triggers, putting a +1/+1 counter on it
Casey triggers, dealing 1 damage to an opponent and causing you to gain 1 life due to its lifelink.
Repeat from step 2.

Light of Promise

Gain life.
Spider-Man triggers, putting a +1/+1 counter on Casey.
Casey triggers, dealing 1 damage to an opponent and causing you to gain 1 life due to its lifelink.
Repeat from step 2.

Spider-Man, Peter Parker

Gain life.
Casey triggers, putting a +1/+1 counter on it.
Casey triggers, dealing 1 damage to an opponent and causing you to gain 1 life due to its lifelink.
Repeat from step 2.

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