Cast Ajani's Chosen by paying its mana cost.
When Ajani's Chosen enters the battlefield as an enchantment due to Enchanted Evening, it triggers, creating a creature token.
When the Spirit enters the battlefield as an enchantment due to Enchanted Evening, Ajani's Chosen's second ability triggers, creating a creature token.
Repeat step 4.

Draw the game

Infinite creature tokens

Infinite ETB

Enchanted Evening

Ajani's Chosen

Cast Ajani's Chosen by paying its mana cost.
When Ajani's Chosen enters the battlefield as an enchantment due to Secret Arcade, it triggers, creating a creature token.
When the Spirit enters the battlefield as an enchantment due to Secret Arcade, Ajani's Chosen's second ability triggers, creating a creature token.
Repeat step 4.

Secret Arcade // Dusty Parlor

Activate Yenna by paying {2} and tapping it, creating a token copy of any Aura you control attached to any creature you control, then causing you to untap Yenna and scry 2.
Ajani's Chosen triggers, creating a 2/2 Cat creature token, then attaching the Aura token to the Cat.
Activate Ashnod's Altar by sacrificing the Cat, adding {C}{C}.
Repeat.

Infinite death triggers

Infinite LTB

Infinite sacrifice triggers

Infinite scry 2

Yenna, Redtooth Regent

Ashnod's Altar

Activate Goblin Bombardment by sacrificing another creature that has an Aura attached to it.
When the creature dies, Cass triggers, returning an Aura that was attached to the creature from your graveyard to the battlefield attached to another creature you control.
When the Aura enters the battlefield, Ajani's Chosen triggers, creating a creature token.
Resolve the Goblin Bombardment ability.
Repeat.

Infinite damage

Cass, Hand of Vengeance

Goblin Bombardment

Cast Rancor by paying {G}, attaching it to Ajani's Chosen.
Rancor enters the battlefield, triggering Ajani's Chosen, creating a 2/2 Cat creature token, and attaching Rancor to the Cat.
Activate Phyrexian Altar by sacrificing the Cat, adding {G}.
Rancor leaves the battlefield, returning itself from your graveyard to your hand.
Repeat.

Infinite storm count

Rancor

Phyrexian Altar

Activate Viscera Seer by sacrificing enchanted creature.
Screams from Within triggers, returning it from the graveyard to the battlefield attaching to Ajani's Chosen.
Ajani's Chosen triggers, creating a 2/2 Cat token and attach Screams from Within to it.
Resolve the Viscera Seer's ability, scrying one.
Repeat.

Infinite scry 1

Screams from Within

Viscera Seer

Cast Traveling Plague by paying {3}{B}{B}, attaching it to another creature you control.
When Traveling Plague enters, Ajani's Chosen triggers, creating a creature token.
Activate Viscera Seer by sacrificing the creature Traveling Plague is attached to.
When the creature dies, Traveling Plague triggers, returning itself from your graveyard to the battlefield attached to the token created in step 2.
When Traveling Plague enters, Ajani's Chosen triggers, creating a creature token.
Resolve the Viscera Seer ability.
Repeat from step 3.

Traveling Plague

Activate Phyrexian Altar by sacrificing the creature with the Aura attached, adding one mana of any color.
Mazzy's second ability triggers, exiling the Aura and allowing you to cast it this turn.
Cast the Aura by paying its mana cost, targeting Mazzy.
Whenever the Aura enters the battlefield, Ajani's Chosen triggers, creating a 2/2 Cat creature token and attaching the Aura to it.
Repeat.

Mazzy, Truesword Paladin

Cast Lightwheel Enhancements either from your hand or from your graveyard by paying {W}, attaching it to another creature you control.
When Lightwheel Enhancements enters the battlefield, Ajani's Chosen triggers, creating a creature token.
Activate Phyrexian Altar by sacrificing the creature with Lightwheel Enhancements attached, adding {W}.
Repeat.

Combos with "Ajani's Chosen"