Staff of Titania attached to any creature you control.
Breath of Fury attached to any creature except the creature that has Staff of Titania attached that has power 1 or greater.
An opponent cannot block creatures you control.
Steps
Declare the creatures with Staff of Titania and Breath of Fury attached as attackers.
Staff of Titania triggers, creating a 1/1 Forest Dryad land creature token.
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 the Forest Dryad token, then causing you to untap all creatures you control and to get an additional combat phase after this one.