Roxanne and Replication Specialist on the battlefield.
({4} magic symbol) ({U} magic symbol) available.
Steps
Cast Basalt Monolith by paying ({3} magic symbol) .
When Basalt Monolith enters the battlefield, Replication Specialist triggers, causing you to pay ({1} magic symbol) ({U} magic symbol) to create a token copy of Basalt Monolith.
Activate the token Basalt Monolith's first ability by tapping it, adding ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) .
Roxanne's second ability triggers, adding ({C} magic symbol) .
Activate the token Basalt Monolith's second ability by paying ({3} magic symbol) , untapping it.