Storm the Vault

Whenever one or more creatures you control deal combat damage to a player, create a colorless Treasure artifact token with "T, Sacrifice this artifact: Add one mana of any color to your mana pool."
At the beginning of your end step, if you control five or more artifacts, transform Storm the Vault.
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Vault of Catlacan
(Transforms from Storm the Vault.)
T: Add one mana of any color to your mana pool.
T: Add U to your mana pool for each artifact you control.