How can you create a combo with Urza, Prince of Kroog, Metalworker, Lightning Greaves?
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[START OF COMBO]This combo can be formed with Urza, Prince of Kroog, Metalworker, Lightning Greaves

Color identity: WU
Mana cost: 
Steps:
  1. Activate Lightning Greaves' equip ability by paying {0}, attaching it to Metalworker.
  2. Activate Metalworker by tapping it and revealing at least three artifact cards from your hand, adding at least six {C}.
  3. Activate Lightning Greaves' equip ability by paying {0}, attaching it to Urza.
  4. Activate Urza by paying {6}, creating a token copy of Metalworker that is a 1/1 Soldier.
  5. Activate Lightning Greaves' equip ability by paying {0}, attaching it to the Metalworker token.
  6. Activate the Metalworker token by tapping it and revealing at least three artifact cards from your hand, adding at least six {C}.
  7. Repeat from step 4.
  8. 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]
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