Storm the Vault // Vault of Catlacan [Rivals of Ixalan]

Description

Whenever one or more creatures you control deal combat damage to a player, create a Treasure token. (It’s an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)
At the beginning of your end step, if you control five or more artifacts, transform Storm the in coins proved harder than they’d hoped, but dancing was a jingling delight.

(Transforms from Storm the Vault.){T}: Add one mana of any color.{T}: Add {U} for each artifact you in coins proved harder than they’d hoped, but dancing was a jingling delight.