Breath of Fury + Leonin Warleader + Cyclops of Eternal Fury
Breath of Fury
Leonin Warleader
Cyclops of Eternal Fury
Infinite creature ETBInfinite creature LTBInfinite combat damageInfinite combat phasesInfinite creature tokens with hasteInfinite death triggersInfinite mana creatures you control can produceInfinite creature sacrifice triggersInfinite untap of creatures you control
How it works
Declare the creature with Breath of Fury attached and Leonin Warleader as attackers.
Leonin Warleader triggers, creating a creature token.
Deal combat damage using the creature that has Breath of Fury attached.
Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the creature token, then causing you to untap all creatures you control and to get an additional combat phase after this one.
Repeat each combat phase.
This brilliant loop relies on chaining extra combat phases by continuously passing your Aura around to fresh attackers. When the creature enchanted by Breath of Fury deals combat damage to a player, it triggers the sacrifice clause, allowing you to seamlessly reattach the enchantment to one of the attacking tokens freshly generated by Leonin Warleader during that very combat step. Because Cyclops of Eternal Fury grants haste to your entire board, every newly spawned Cat token can immediately join the assault in the subsequent combat phase generated by the Aura's untap effect. Repeating this cycle lets you churn through infinite combat steps, continuously sacrificing and replacing your creatures while overwhelming opponents with endless damage.