Urza, Prince of Kroog + Corridor Monitor + Metalworker

Urza, Prince of Kroog

Corridor Monitor

Metalworker

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 Corridor Monitor that is a 1/1 Soldier in addition to its other types.
3. When the Corridor Monitor token enters the battlefield, it 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 other artifact(s) you control.

This loop hinges on a clever mechanical synergy: Metalworker acts as our mana engine by tapping to generate massive amounts of colorless mana based on the artifacts in your hand, while Urza, Prince of Kroog uses that mana to repeatedly copy Corridor Monitor. Every time a new Corridor Monitor token enters the battlefield, its triggered ability untaps Metalworker, allowing you to repeat the process as long as you have enough artifacts in hand to fund Urza, Prince of Kroog's activation. Along the way, Urza, Prince of Kroog's static lord ability grants all your artifact creatures a permanent +2/+2 buff, turning your endless army of 1/1 Soldier artifact copies into formidable threats.