Cast Gremlin Tamer by paying its mana cost.
When Gremlin Tamer enters the battlefield as an enchantment due to Secret Arcade, it triggers, creating a creature token.
When the creature tokens enters the battlefield as an enchantment due to Secret Arcade, Gremlin Tamer's second ability triggers, creating a creature token.
Repeat step 3.

Infinite creature ETB

Infinite creature tokens

Draw the game

Secret Arcade // Dusty Parlor

Gremlin Tamer

Cast Gremlin Tamer by paying its mana cost.
When Gremlin Tamer enters the battlefield as an enchantment due to Enchanted Evening, it triggers, creating a creature token.
When the creature token enters the battlefield as an enchantment due to Enchanted Evening, Gremlin Tamer's second ability triggers, creating a creature token.
Repeat step 3.

Enchanted Evening

Cast Screams from Within by paying {1}{B}{B}, attaching it to a creature with toughness equal to 1.
The creature dies as a state-based action due to having 0 toughness.
Gremlin Tamer and Screams from Within trigger.
Resolve the Gremlin Tamer trigger, creating a 1/1 Gremlin creature token.
Resolve the Screams from Within trigger, returning it from your graveyard to the battlefield attached to the Gremlin.
Repeat from step 2.

Infinite creature LTB

Infinite death triggers

Screams from Within

Cast Traveling Plague by paying {3}{B}{B}, attaching it to another creature you control.
When Traveling Plague enters, Gremlin Tamer 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, Gremlin Tamer triggers, creating a creature token.
Resolve the Viscera Seer ability.
Repeat from step 3.

Infinite creature sacrifice triggers

Infinite scry 1

Traveling Plague

Viscera Seer

Cast Rancor by paying {G}, attaching it to any other creature you control.
When Rancor enters, Gremlin Tamer triggers, creating a creature token.
Activate Phyrexian Altar by sacrificing the creature with Rancor attached, adding {G}.
Rancor triggers, returning itself from your graveyard to your hand.
Repeat.

Infinite storm count

Phyrexian Altar

Rancor

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, Gremlin Tamer triggers, creating a creature token.
Activate Phyrexian Altar by sacrificing the creature with Lightwheel Enhancements attached, adding {W}.
Repeat.

Lightwheel Enhancements

Activate Spawning Pit 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, Gremlin Tamer triggers, creating a creature token.
Resolve the Spawning Pit ability.
Repeat.

Infinite charge counters on a permanent

Cass, Hand of Vengeance

Spawning Pit

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 until your next turn.
Cast the Aura from exile by paying its mana cost, attaching it to any other creature you control.
When the Aura enters, Gremlin Tamer triggers, creating a creature token.
Repeat.

Combos with "Gremlin Tamer"