Activate Faith Healer by sacrificing Spirit Loop.
Spirit Loop and Starfield Mystic triggers.
Resolve the Starfield Mystic trigger, putting a +1/+1 counter on it.
Resolve the Spirit Loop trigger, 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 any creature.
Defiler of Faith triggers, 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

Spirit Loop

Starfield Mystic

Cast Chthonian Nightmare by paying {B}.
When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
Activate Chthonian Nightmare by paying {E}, sacrificing Greedy Freebooter and returning Chthonian Nightmare from the battlefield to your hand.
When Greedy Freebooter dies, it triggers, causing you to scry 1 and create a Treasure token.
Resolve the Chthonian Nightmare ability, returning Shambling Ghast from your graveyard to the battlefield.
Activate the Treasure by tapping and sacrificing it, adding {B}.
Cast Chthonian Nightmare by paying {B}.
When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
Activate Chthonian Nightmare by paying {E}, sacrificing Shambling Ghast and returning Chthonian Nightmare from the battlefield to your hand.
When Shambling Ghast dies, it triggers, creating a Treasure token.
Resolve the Chthonian Nightmare ability, returning Greedy Freebooter from your graveyard to the battlefield.
Activate the Treasure by tapping and sacrificing it, adding {B}.
Repeat.

Infinite creature LTB

Infinite death triggers

Infinite energy counters

Infinite creature sacrifice triggers

Infinite scry 1

Chthonian Nightmare

Greedy Freebooter

Shambling Ghast

Activate Faith Healer by sacrificing Brilliant Halo.
Brilliant Halo and Starfield Mystic triggers.
Resolve the Starfield Mystic trigger, putting a +1/+1 counter on it.
Resolve the Brilliant Halo trigger, 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 any creature.
Defiler of Faith triggers, creating a 1/1 Soldier creature token.
Repeat.

Brilliant Halo

Activate Chthonian Nightmare by paying at most {E}{E}{E}, sacrificing Patron of the Arts and returning Chthonian Nightmare from the battlefield to your hand.
When Patron of the Arts dies, it triggers, creating a Treasure token.
Resolve the Chthonian Nightmare ability, returning another creature card from your graveyard to the battlefield.
Activate the Treasure by tapping and sacrificing it, adding {B}.
Cast Chthonian Nightmare by paying {B}.
When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
Activate Chthonian Nightmare by paying {E}{E}{E}, sacrificing another creature and returning Chthonian Nightmare from the battlefield to your hand, returning Patron of the Arts from your graveyard to the battlefield.
When Patron of the Arts enters the battlefield, it triggers, creating a Treasure token.
Activate the Treasure by tapping and sacrificing it, adding {B}.
Cast Chthonian Nightmare by paying {B}.
When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
Repeat.

Patron of the Arts

Combos with "Starfield Mystic"