Activate Visara the Dreadful by tapping it, destroying another creature you control.
When the creature dies as an Angel due to Arcane Adaptation, Bishop of Wings' second ability triggers, creating a 1/1 Spirit creature token.
When the Spirit enters the battlefield as an Angel due to Arcane Adaptation, Bishop of Wings' first ability and Intruder Alarm trigger.
Resolve the Bishop of Wings trigger, causing you to gain 4 life.
Resolve the Intruder Alarm trigger, untapping all creatures.
Repeat.
This intricate loop turns Visara the Dreadful into a grim engine of perpetual motion by leveraging Arcane Adaptation to make every creature you control count as an Angel. With Bishop of Wings watching over them, sacrificing a creature triggers the creation of a 1/1 Spirit token—which itself enters as an Angel to fuel both the Bishop's life-gaining trigger and Intruder Alarm's global untap. Because Intruder Alarm resets Visara the Dreadful after every execution, you can repeat the process indefinitely to secure endless life and an unbroken chain of creature deaths and entries.