Breath of Fury + We Ride at Dawn + Hammer of Purphoros
Breath of Fury
We Ride at Dawn
Hammer of Purphoros
Infinite combat damageInfinite combat phasesInfinite death triggersInfinite creature ETBInfinite creature LTBInfinite mana creatures you control can produceInfinite creature sacrifice triggersInfinite untap of creatures you control
How it works
Declare your commander and the creature with Breath of Fury attached as attackers.
We Ride at Dawn's second ability triggers, creating a 1/1 Mercenary 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 Mercenary token, then causing you to untap all creatures you control and to get an additional combat phase after this one.