Breath of Fury and Death Tyrant on the battlefield (Breath of Fury attached to any creature you control except Death Tyrant.).
You control at least two additional creatures.
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 triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to any creature you control except Death Tyrant, then causing you to untap all creatures you control and to get an additional combat phase after this one.
When the creature that had Breath of Fury attached dies, Death Tyrant triggers, creating a 2/2 Zombie creature token.