Codex Shredder + Krark-Clan Ironworks + Scrap Mastery

R identity

Commander legal

The 3 combo pieces

What must be in place

You control any number of mana-producing artifact(s) that enter the battlefield untapped and that can tap to produce at least {R}{R}.
You control at least three additional nontoken artifacts, including the mana-producing artifact(s).

How to execute it

  1. Activate any number of mana-producing artifacts you control by tapping them, adding at least {R}{R}.
  2. Activate Krark-Clan Ironworks by sacrificing any artifact except itself, adding {C}{C}.
  3. Repeat step 2 for each remaining applicable artifact.
  4. Activate Krark-Clan Ironworks by sacrificing itself, adding {C}{C}.
  5. Cast Scrap Mastery by paying {3}{R}{R}, causing each player to exile all artifact cards from your graveyard, then sacrifice all artifacts they control, then return all exiled cards from exile to the battlefield.
  6. Repeat steps 1-4 one additional time.
  7. Activate Codex Shredder's second ability by paying {5}, tapping and sacrificing it, returning Scrap Mastery from your graveyard to your hand.
  8. Repeat from step 5.
  9. If artifacts you control can tap to produce at least {1}{R}{R}, this combo nets infinite mana of those types.
  10. If you control four or more other nontoken artifacts as this combo begins, this combo nets infinite colorless mana.

What the combo produces