Scrap Trawler + Sculpting Steel + Ashnod's Altar + Foundry Inspector

Scrap Trawler
Sculpting Steel
Ashnod's Altar
Foundry Inspector

Requires
Scultping Steel in hand. All other permanents on the battlefield. A player controls a nonlegendary artifact creature with mana value four or greater. 2 available.
Steps
  1. Cast Sculpting Steel by paying 2, choosing to have it enter the battlefield as a copy of any nonlegendary artifact creature with mana value four or greater
  2. Activate Ashnod's Altar by sacrificing Sculpting Steel, adding cc
  3. Sculpting Steel dies, triggering Scrap Trawler, returning Sculpting Steel from your graveyard to your hand
  4. Repeat
Results
Infinite ETB. Infinite LTB. Infinite death triggers. Infinite sacrifice triggers. Infinite storm count.