Breath of Fury and Desert Warfare on the battlefield.
You control at least five Deserts.
Breath of Fury attached to any creature you control that does not have summoning sickness.
An opponent cannot block creatures you control.
Steps
At the beginning of your combat phase, Desert Warfare's second ability triggers, creating a 1/1 Sand Warrior creature token with haste for each Desert you control.
Deal combat damage to an opponent 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 Sand Warrior token, then causing you to untap all creatures you control and to get an additional combat phase after this one.