Activate Kiki-Jiki by tapping it, creating a token copy of Lumbering Battlement.
When the Lumbering Battlement token enters the battlefield, it triggers, exiling Kiki-Jiki until Lumbering Battlement leaves the battlefield.
Activate Goblin Bombardment by sacrificing the Lumbering Battlement token.
When the Lumbering Battlement token dies, Kiki-Jiki is returned from exile to the battlefield.
Resolve the Goblin Bombardment ability.
Repeat.
This elegant loop turns Kiki-Jiki, Mirror Breaker's legendary limitation into an asset by continuously cloning Lumbering Battlement, whose entry trigger safely tucks away Kiki-Jiki into exile. With Kiki-Jiki momentarily stashed away, you simply use Goblin Bombardment to sacrifice the Lumbering Battlement token, which immediately returns Kiki-Jiki to the battlefield and lets you repeat the whole cycle. Because Goblin Bombardment converts each sacrificed token into direct damage right on the spot, this self-sustaining loop translates your endless creature recycling into an immediate victory.