Storm the Vault // Vault of Catlacan

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 token: Add one mana of any color.") At the beginning of your end step, if you control five or more artifacts, transform Storm the Vault.

(Transforms from Storm the Vault.) T: Add one mana of any color. T: Add U for each artifact you control.