Storm the Vault // Vault of CatlacanRivals of Ixalan - Singles

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."
At the beginning of your end step, if you control five or more artifacts, transform Storm the Vault.

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