Metalworker + Razortide Bridge + Retreat to Coralhelm + Urza, Prince of Kroog

WU identity

Commander legal

The 4 combo pieces

What must be in place

You have at least three artifact cards in hand.
Metalworker does not have summoning sickness.

How to execute it

  1. Activate Metalworker by tapping it and revealing at least three artifact cards from your hand, adding at least six {C}.
  2. Activate Urza by paying {6}, creating a token copy of Razortide Bridge that is a 1/1 Soldier.
  3. When the Razortide Bridge token enters the battlefield, Retreat to Coralhelm triggers, untapping Metalworker.
  4. Repeat.
  5. If you have four or more artifact cards in hand, this combo nets infinite colorless mana, and you may target any artifact you control to get infinite copies of them.

What the combo produces