Breath of Fury and Warchanter Skald on the battlefield.
Breath of Fury attached to any other creature you control.
An opponent cannot block creatures you control.
You control a Mountain.
Warchanter Skald has at least one Aura and/or Equipment attached.
Steps
Declare Warchanter Skald and the creature with Breath of Fury attached as attackers.
Warchanter Skald triggers, creating a 2/1 Dwarf Berserker creature token.
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 Dwarf Berserker token, untap all creatures you control and to get an additional combat phase after this one.