Roxanne, Starfall Savant, Basalt Monolith, and Echo Storm

Prerequisites

• Roxanne, Starfall Savant on the battlefield
• Basalt Monolith on the battlefield
• Echo Storm in hand
• available

Steps

1. Cast Echo Storm by paying , targeting Basalt Monolith
2. Echo Storm triggers, copying it for each time you've cast your commander from the command zone this game, targeting any artifact
3. Resolve all Echo Storms, creating a token copy of Basalt Monolith and any other artifact(s) as applicable
4. Activate the token Basalt Monolith's first ability by tapping it, adding
5. Roxanne's second ability triggers, adding
6. Activate the token Basalt Monolith's second ability by paying , untapping it
7. Repeat from step 4

Results

• Infinite colorless mana