Breath of Fury attached to any other creature you control.
An opponent cannot block creatures you control.
You control a Mountain.
Steps
Declare Emmara and the creature with Breath of Fury attached as attackers.
Emmara triggers, creating a 1/1 Soldier creature token with lifelink.
Deal combat damage to an opponent using the creature with 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 Soldier token, untap all creatures you control and to get an additional combat phase after this one.