How can you create a combo with Basalt Monolith, Xenic Poltergeist, Training Grounds?
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[START OF COMBO]This combo can be formed with Basalt Monolith, Xenic Poltergeist, Training Grounds

Color identity: UB
Mana cost: 
Steps:
  1. Activate Xenic Poltergeist by tapping it, causing Basalt Monolith to become an artifact creature until end of turn.
  2. Activate Basalt Monolith's first ability by tapping it, adding {C}{C}{C}.
  3. Activate Basalt Monolith's last ability by paying {1}, untapping it.
  4. Repeat from step 2.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
  - Basalt Monolith and Xenic Poltergiest do not have summoning sickness.
[END OF COMBO PREREQUISITES]
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