Audacious Reshapers does not have summoning sickness.
Steps
Activate Audacious Reshapers by tapping it and sacrificing Etched Familiar.
When Etched Familiar dies, it and Mortuary trigger.
Resolve the Etched Familiar trigger, causing each opponent to lose 2 life andyou to gain 2 life.
Resolve the Mortuary trigger, putting Etched Familiar on top of your library from your graveyard.
Resolve the Audacious Reshapers ability, revealing Etched Familiar from the top of your library, then putting it onto the battlefield and dealing 1 damage to you.
When Etched Familiar enters the battlefield, Intruder Alarm triggers, untapping all creatures.