Breath of Fury attached to any other creature you control that can attack this turn.
Tana does not have summoning sickness.
An opponent is unable to block and kill your creatures.
Steps
Deal combat damage with Tana and the creature that has Breath of Fury attached.
Tana and Breath of Fury triggers.
Resolve the Tana trigger, creating a number of 1/1 Saproling creature tokens equal to the damage Tana dealt.
Resolve the Breath of Fury trigger, causing you to sacrifice the creature it is attached to, attach Breath of Fury to a Saproling token, untap all creatures you control and get an additional combat phase after this one.