Breath of Fury and Spellbinder attached to different creatures you control.
An opponent cannot block the creatures with Breath of Fury and Spellbinder attached.
Steps
Deal combat damage to an opponent using the creatures that have Spellbinder and Breath of Fury attached.
Spellbinder and Breath of Fury trigger.
Resolve the Spellbinder trigger, casting a copy of Exotic Pets without paying its mana cost.
Resolve the copy of Exotic Pets, creating two 1/1 Fish creature tokens.
Resolve the Breath of Fury trigger, causing you to sacrifice the creature it is attached to, attach Breath of Fury to a Fish token, untap all creatures you control and get an additional combat phase after this one.