Deal damage to Brash Taunter.
Brash Taunter and Blazing Sunsteel trigger.
Resolve the Brash Taunter trigger, dealing damage to any opponent.
Resolve the Blazing Sunsteel trigger, dealing damage to Brash Taunter.
Repeat from step 2.

Infinite damage

Blazing Sunsteel

Brash Taunter

Deal damage to the creature that has Blazing Sunsteel attached.
Blazing Susnteel triggers twice. Resolve the first trigger, dealing damage to any target.
Resolve the second Blazing Sunsteel trigger, dealing damage to the creature it is attached to.
Repeat from step 2.

Wayta, Trainer Prodigy

Deal damage to the indestructible creature.
Blazing Sunsteel triggers, dealing damage equal to the damage dealt to any target.
Guilty Conscience triggers, dealing damage equal to the damage dealt to the indestructible creature.
Repeat from step 2.

Guilty Conscience

Give Metropolis Reformer indestructible, and then deal damage to Metropolis Reformer.
Metropolis Reformer and Blazing Sunsteel trigger.
Resolve the Metropolis Reformer trigger, causing you to gain life equal to the damage dealt.
Resolve the Blazing Sunsteel trigger, dealing that much damage to Metropolis Reformer.
Repeat from step 2.

Infinite lifegain

Infinite lifegain triggers

Metropolis Reformer

Deal exactly 1 damage to Indoraptor.
Indoraptor, Rite of Passage and Blazing Sunsteel trigger.
Resolve the Rite of Passage trigger, putting a +1/+1 counter on Indoraptor.
Resolve the Indoraptor trigger, causing it to deal damage equal to its power to a random opponent unless they sacrifice a creature.
Resolve the Blazing Sunsteel trigger, dealing 1 damage to Indoraptor.
Repeat from step 2.

Infinite +1/+1 counters on Indoraptor

Indoraptor, the Perfect Hybrid

Rite of Passage

Give Sporeweb Weaver indestructible by any method.
Deal damage to Sporeweb Weaver.
Sporeweb Weaver and Blazing Sunsteel trigger.
Resolve the Sporeweb Weaver trigger, creating a 1/1 green Saproling creature token and gaining you 1 life.
Resolve the Blazing Sunsteel trigger, dealing at least one damage to Sporeweb Weaver.
Repeat from step 3.

Infinite creature tokens

Infinite ETB

Sporeweb Weaver

Deal damage to the indestructible creature.
Blazing Sunsteel and Sculpting Steel trigger.
Resolve the Blazing Sunsteel trigger, dealing damage equal to the damage dealt to any target.
Resolve the Sculpting Steel trigger, dealing damage equal to the damage dealt to the indestructible creature.
Repeat from step 2.

Sculpting Steel

Give Zalto indestructible by any method.
Deal damage to Zalto.
Blazing Sunsteel and Zalto trigger.
Resolve the Zalto trigger, causing you to venture into the dungeon.
Resolve the Blazing Sunsteel trigger, dealing that much damage to Zalto.
Repeat from step 3.

Infinite ventures into the dungeon

Infinite card draw

Near-infinite +1/+1 counters

Near-infinite lifegain

Near-infinite lifeloss

Near-infinite lifegain triggers

Near-infinite ETB

Infinite draw triggers

Near-infinite colored mana

Near-infinite creature tokens

Near-infinite Treasure tokens

Cast a portion of the cards in your library without paying their mana costs

Zalto, Fire Giant Duke

Activate The Mycosynth Gardens' third ability by paying {2} and tapping it, causing it to become a copy of Blazing Sunsteel.
Activate The Mycosynth Gardens' equip ability by paying {4}, attaching it to the creature that has Blazing Sunsteel attached.
Deal damage to the creature with Blazing Sunsteel and The Mycosynth Gardens attached.
Blazing Sunsteel and The Mycosynth Gardens trigger.
Resolve the Blazing Sunsteel trigger, dealing damage to any target.
Resolve the Mycosynth Gardens trigger, dealing damage to the creature.
Repeat from step 4.

The Mycosynth Gardens

Activate Mirage Mirror by paying {2}, causing it to become a copy of Blazing Sunsteel until end of turn.
Activate Mirage Mirror's equip ability by paying {4}, attaching it to the indestructible creature with Blazing Sunsteel attached.
Deal damage to the indestructible creature.
Blazing Sunsteel and Mirage Mirror trigger.
Resolve the Blazing Sunsteel trigger, dealing damage equal to the damage dealt to any target.
Resolve the Mirage Mirror trigger, dealing damage equal to the damage dealt to the indestructible creature.
Repeat from step 2.

Combos with "Blazing Sunsteel"