Roxanne, Starfall Savant + Basalt Monolith + Relm's Sketching

Roxanne, Starfall Savant

Basalt Monolith

Relm's Sketching

How it works

1. Cast Relm's Sketching by paying 2, creating a token copy of Basalt Monolith.
2. Activate the token Basalt Monolith's first ability by tapping it, adding CCC.
3. Roxanne's second ability triggers, adding C.
4. Activate the token Basalt Monolith's second ability by paying 3, untapping it.
5. Repeat from step 2.