The One Ring + Conduit of Worlds + Arcbound Ravager

The One Ring
Conduit of Worlds
Arcbound Ravager

Requires
All permanents on the battlefield. You have not cast a spell this turn. 4 available during each of your turns.
Steps
  1. Activate Arcbound Ravager by sacrificing The One Ring, putting a +1/+1 counter on Arcbound Ravager
  2. Activate Conduit of Worlds by tapping it, causing you to pay 4 to cast The One Ring from your graveyard
  3. The One Ring triggers, giving you protection from everything until your next turn
  4. Repeat during each of your turns
Results
You gain protection from everything. Prevent all damage that would be dealt to you. You cannot cast spells.