Muldrotha, the Gravetide + The One Ring + Arcbound Ravager

Muldrotha, the Gravetide
The One Ring
Arcbound Ravager

Requires
All permanents on the battlefield. You have not cast an artifact spell using Muldrotha 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. Cast The One Ring from your graveyard by paying 4
  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.