Breath of Fury and Adeline on the battlefield (Breath of Fury attached to any creature you control except Adeline).
An opponent cannot block creatures you control.
You control at least one Mountain.
Steps
Declare the creature with Breath of Fury attached as an attacker.
Adeline triggers, creating a 1/1 Human creature token tapped and attacking each opponent.
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 a Human token, then causing you to untap all creatures you control and to get an additional combat phase after this one.