An opponent is unable to block and kill Burakos and Hellkite Charger.
Steps
Declare Burakos and Hellkite Charger as attackers, triggering their abilities.
Resolve the Burakos trigger, creating four Treasure artifact tokens and causing the defending opponent to lose 4 life.
Activate the Treasure tokens by tapping and sacrificing them, adding ({6} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Resolve the Hellkite Charger trigger, causing you to pay ({5} magic symbol) ({R} magic symbol) ({R} magic symbol) to untap all attacking creatures and to get an additional combat phase after this one.