How can you create a combo with Urza, Prince of Kroog, Metalworker, Thousand-Year Elixir?
user
[START OF COMBO]This combo can be formed with Urza, Prince of Kroog, Metalworker, Thousand-Year Elixir

Color identity: WU
Mana cost: 
Steps:
  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 Metalworker that is a 1/1 Soldier.
  3. Repeat using the Metalworker token instead.
  4. 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.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite copies of each artifact you control
  - Infinite creature tokens
  - Infinite enters the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You have at least three artifact cards in hand.
[END OF COMBO PREREQUISITES]
assistant