Activate The Blackstaff of Waterdeep by paying ({1} magic symbol) ({U} magic symbol) and tapping it, causing Basalt Monolith to become an artifact creature.
Activate Basalt Monolith's first ability by tapping it, adding ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) .
Activate Basalt Monolith's last ability by paying ({2} magic symbol) , untapping it.