An opponent is unable to block and kill creatures you control.
You control an additional Angel.
Steps
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 it to another Angel you control, untap all creatures you control, and get an additional combat phase after this one.
The Angel dies, triggering Bishop of Wings' second ability, creating a 4/4 Angel creature token due to Divine Visitation.
The Angel enters the battlefield, triggering Bishop of Wings' first ability, causing you to gain four life.