Activate Goblin Bombardment by sacrificing the persist or undying creature.
When the creature dies, its persist or undying ability triggers if it doesn't have a -1/-1 counter or +1/+1 counter on it respectively, and Luminous Broodmoth triggers if the creature didn't have flying.
Resolve the persist or undying trigger, if applicable, returning the creature from your graveyard to the battlefield with either a -1/-1 counter or a +1/+1 counter on it.
Resolve the Luminous Broodmoth trigger, if applicable, returning the creature from your graveyard to the battlefield with a flying counter on it if the creature is still in your graveyard.
Resolve the Goblin Bombardment ability.
Repeat.

Infinite LTB

Infinite ETB

Infinite sacrifice triggers

Infinite death triggers

Infinite damage

Creature with Persist or Undying

Luminous Broodmoth

Goblin Bombardment

Activate Goblin Bombardment by sacrificing Reassembling Skeleton.
When Reassembling Skeleton dies, Luminous Broodmoth and Pitiless Plunderer trigger.
Resolve the Luminous Broodmoth trigger, returning Reassembling Skeleton from your graveyard to the battlefield with a flying counter on it.
Resolve the Pitiless Plunderer trigger, creating a Treasure token.
Activate Goblin Bombardment by sacrificing Reassembling Skeleton.
When Reassembling Skeleton dies, Pitiless Plunderer triggers, creating a Treasure token.
Resolve the Goblin Bombardment abilities from steps 1 and 5
Activate the Treasures by tapping and sacrificing them, adding {1}{B}.
Activate Reassembling Skeleton by paying {1}{B}, returning it from your graveyard to the battlefield.
Repeat.

Pitiless Plunderer

Reassembling Skeleton

Activate Goblin Bombardment by sacrificing another nontoken creature that doesn't have flying.
When the creature dies, Luminous Broodmoth triggers, returning the creature from your graveyard to the battlefield with a flying counter on it.
Activate Goblin Bombardment by sacrificing the creature with a flying counter on it.
When the creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Resolve the Goblin Bombardment abilities from step 1 and 3.
Repeat.

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Activate Goblin Bombardment by sacrificing a creature without flying.
When the creature dies, Luminous Broodmoth triggers, returning the creature from your graveyard to the battlefield without a flying counter on it due to Solemnity.
Resolve the Goblin Bombardment ability.
Repeat.

Solemnity

Activate Goblin Bombardment by sacrificing the creature.
When the creature dies, its undying ability triggers if it didn't have a +1/+1 counter, and Luminous Broodmoth triggers if the creature didn't have flying.
Resolve the undying trigger, if applicable, returning the creature from your graveyard to the battlefield with a +1/+1 counter on it.
Resolve the Luminous Broodmoth trigger, if applicable, returning the creature from your graveyard to the battlefield with a flying counter on it if the creature is still in your graveyard.
Resolve the Goblin Bombardment ability.
Repeat.

Mikaeus, the Unhallowed

Activate Goblin Bombardment by sacrificing Optimus Prime, Hero.
When Optimus Prime, Hero dies, its second ability triggers, returning it from your graveyard to the battlefield as Optimus Prime, Autobot Leader.
Activate Goblin Bombardment by sacrificing Optimus Prime, Autobot Leader.
When Optimus Prime, Autobot Leader dies, Luminous Broodmoth triggers, returning Optimus Prime from your graveyard to the battlefield as Optimus Prime, Hero with a flying counter on it.
Resolve both Goblin Bombardment abilities from steps 1 and 3, dealing 2 damage to any target.
Repeat.

Optimus Prime, Hero // Optimus Prime, Autobot Leader

Activate Goblin Bombardment by sacrificing Infernal Vessel.
When Infernal Vessel dies, it triggers, returning itself from your graveyard to the battlefield as a Demon in addition to its other types.
Resolve the Goblin Bombardment ability.
Activate Goblin Bombardment by sacrificing Infernal Vessel.
When Infernal Vessel dies, Luminous Broodmoth triggers, returning Infernal Vessel from your graveyard to the battlefield with a flying counter on it.
Resolve the Goblin Bombardment ability.
Repeat.

Infernal Vessel

Activate Goblin Bombardment by sacrificing Suncleanser.
When Suncleanser dies, Luminous Broodmoth triggers, returning Suncleanser from your graveyard to the battlefield with a flying counter on it.
When Suncleanser enters the battlefield, it triggers, removing the flying counter from Suncleanser.
Resolve the Goblin Bombardment ability.
Repeat.

Suncleanser

Activate Goblin Bombardment by sacrificing Medicine Runner.
When Medicine Runner dies, Luminous Broodmoth triggers, returning Medicine Runner from your graveyard to the battlefield with a flying counter on it.
When Medicine Runner enters the battlefield, it triggers, removing the flying counter from Medicine Runner.
Resolve the Goblin Bombardment ability.
Repeat.

Medicine Runner

Activate Goblin Bombardment by sacrificing Melira's Keepers.
When Melira's Keepers dies, Luminous Broodmoth triggers, returning Melira's Keepers from your graveyard to the battlefield without a flying counter on it due to Melira's Keepers' ability.
Resolve the Goblin Bombardment ability.
Repeat.

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