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

Color identity: U
Mana cost: 
Steps:
  1. Activate Basalt Monolith's first ability by tapping it, adding {C}{C}{C}.
  2. Activate Karn by paying {1}, causing Basalt Monolith to become an artifact creature until end of turn.
  3. Activate Basalt Monolith's second ability by paying {1}, untapping it.
  4. Activate Basalt Monolith's first ability by tapping it, adding {C}{C}{C}.
  5.  Repeat from step 3.[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 does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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