Roxanne, Starfall Savant | Basalt Monolith | Echo Storm

Cards

Cast
Echo Storm by paying ({3} magic symbol) ({U} magic symbol) ({U} magic symbol) , targeting
Basalt Monolith.
Echo Storm triggers, copying it for each time you've cast your commander from the command zone this game, targeting any artifact.
Resolve all
Echo Storms, creating a token copy of
Basalt Monolith and any other artifact(s) as applicable.
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.
Repeat from step 4.