Silvanus's Invoker and Storm the Vault // Vault of Catlacan on the battlefield.
You control at least nine artifacts.
Steps
Activate Vault of Catlacan's second ability by tapping it, adding at least nine ({U} magic symbol) .
Activate Silvanus's Invoker by paying ({8} magic symbol) , causing Vault of Catlacan to become a 8/8 Elemental with haste, and untapping Vault of Catlacan.