Breath of Fury and Orochi Soul-Reaver on the battlefield (Breath of Fury attached to any creature you control).
An opponent cannot block creatures you control.
You control at least one Mountain.
Steps
Deal combat damage using the creature that has Breath of Fury attached.
Breath of Fury and Orochi Soul-Reaver trigger.
Resolve the Orochi Soul-Reaver trigger, creating a Treasure token and causing you to manifest the top card of the damaged opponent's library.
Resolve the Breath of Fury trigger, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the manifested card, then causing you to untap all creatures you control and to get an additional combat phase after this one.