How can you create a combo with Roxanne, Starfall Savant, Basalt Monolith, Echo Storm?
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[START OF COMBO]This combo can be formed with Roxanne, Starfall Savant, Basalt Monolith, Echo Storm

Color identity: GUR
Mana cost: {3}{U}{U}
Steps:
  1. Cast Echo Storm by paying {3}{U}{U}, 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 {C}{C}{C}.
  5. Roxanne's second ability triggers, adding {C}.
  6. Activate the token Basalt Monolith's second ability by paying {3}, untapping it.
  7. Repeat from step 4.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Roxanne, Starfall Savant must be on the battlefield
  - Basalt Monolith must be on the battlefield
  - Echo Storm must be in your hand
[END OF COMBO PREREQUISITES]
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