Activate Faith Healer by sacrificing Brilliant Halo.
Brilliant Halo triggers, returning it from your graveyard to your hand.
Resolve the Faith Healer ability, causing you to gain two life.
Cast Brilliant Halo by paying two life, targeting Hero of Iroas.
Defiler of Faith and Hero of Iroas triggers.
Resolve the Hero or Iroas trigger, putting a +1/+1 counter on it.
Resolve the Defiler of Faith trigger, creating a 1/1 Soldier creature token.
Repeat.

Infinite +1/+1 counters on a creature

Infinite creature tokens

Infinite creature ETB

Infinite storm count

Defiler of Faith

Faith Healer

Brilliant Halo

Hero of Iroas

Activate Faith Healer by sacrificing Spirit Loop.
Spirit Loop triggers, returning it from your graveyard to your hand.
Resolve the Faith Healer ability, causing you to gain two life.
Cast Spirit Loop by paying two life, targeting Hero of Iroas.
Defiler of Faith and Hero of Iroas triggers.
Resolve the Hero or Iroas trigger, putting a +1/+1 counter on it.
Resolve the Defiler of Faith trigger, creating a 1/1 Soldier creature token.
Repeat.

Spirit Loop

Activate Faith Healer by sacrificing Fiery Mantle.
When Fiery Mantle leaves the battlefield, it triggers, returning itself to your hand from your graveyard.
Resolve the Faith Healer ability, causing you to gain two life.
Cast Fiery Mantle by paying two life, targeting Hero of Iroas.
Defiler of Instinct and Hero of Iroas trigger.
Resolve the Defier of Instinct trigger, dealing 1 damage to any target.
Resolve the Hero of Iroas trigger, putitng a +1/+1 counter on it.
Repeat.

Infinite damage

Infinite lifegain triggers

Fiery Mantle

Defiler of Instinct

Combos with "Hero of Iroas"