Fable of the Mirror-Breaker // Reflection of Kiki-Jiki | Combat Celebrant

Cards

Activate
Reflection of KIki-Jiki by paying ({1} magic symbol) and tapping it, creating a token copy of
Combat Celebrant with haste.
Declare
Ancient Copper Dragon and
Combat Celebrant token as attackers, choosing to exert
Combat Celebrant as it attacks.
When you attack, the token
Combat Celebrant triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one.
When you deal combat damage,
Ancient Copper Dragon triggers, creating at least one Treasure token.
Activate a Treasure by tapping and sacrificing it, adding one mana.
Repeat.

This combo has been estimated to be Exhibition (Bracket 1+).