Triumph of Saint Katherine dies, triggering itself and
Atla Palani
Resolve the
Triumph of Saint Katherine trigger, exiling it and the top six cards of your library into a face-down pile, then shuffling that pile and putting it on top of your library
Resolve the
Atla Palani trigger, revealing cards from the top of your library until you reveal a creature card and putting that card onto the battlefield
Resolve the
Goblin Bombardment ability, dealing 1 damage to any target
Activate
Goblin Bombardment by sacrificing that creature
Repeat from step 4 until
Triumph of Saint Katherine is on the battlefield again
Repeat from step 1
Results
Infinite damage
Infinite ETB
Infinite LTB
Infinite death triggers
Infinite sacrifice triggers
Put all creatures in your library onto the battlefield, then into your graveyard