Urza, Prince of Kroog
Metalworker
Retreat to Coralhelm
Treasure Vault

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.
You have at least three artifact cards in hand. Metalworker does not have summoning sickness.

   Steps

How does this combo work?
1
Activate Metalworker by tapping it and revealing at least three artifact cards from your hand, adding at least six .
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.

   Results

What do I get from this combo?
Infinite colorless mana
Infinite copies of artifacts you control
Infinite creature tokens
Infinite ETB
Infinite landfall triggers
Infinite creature copies of artifacts you control
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