Breath of Fury and Giant Adephage on the battlefield.
Breath of Fury attached to Giant Adephage.
An opponent is unable to block and kill creatures you control.
You control a mountain.
Steps
Declare Giant Adephage as an attacker.
Deal combat damage with Giant Adephage.
Giant Adephage and Breath of Fury trigger.
Resolve the Giant Adephage trigger, creating a token copy of Giant Adephage.
Resolve the Breath of Fury trigger, causing you to sacrifice Giant Adephage, attach Breath of Fury to a token copy of Giant Adephage, untap all creatures you control and get an additional combat phase after this one.