Urza, Prince of Kroog + Metalworker + Retreat to Coralhelm + Treasure Vault

Urza, Prince of Kroog

Metalworker

Retreat to Coralhelm

Treasure Vault

How it works

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 Treasure Vault that is a 1/1 Soldier.
3. When the Treasure Vault 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.

This clever engine relies on Metalworker's explosive mana production, fueled by revealing artifacts from your hand, to fund Urza, Prince of Kroog's ability to copy your permanents. By targeting your own Treasure Vault with Urza's copy effect, you generate a 1/1 Soldier token copy of the land that immediately triggers Retreat to Coralhelm's landfall ability when it enters the battlefield. This untaps Metalworker so you can tap it again for massive mana, letting you loop the process to generate infinite colorless mana, infinite artifact copies, and an endless army of creatures.