Breath of Fury attached to any other creature you control.
An opponent cannot block creatures you control.
Steps
Declare the creature with Breath of Fury attached as an attacker.
Rabble Rousing triggers, creating a 1/1 Human Citizen 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 Human Citizen token, then causing you to untap all creatures you control and to get an additional combat phase after this one.