How can you create a combo with Experiment Kraj, Gilder Bairn, Training Grounds, Clutch of Currents?
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[START OF COMBO]This combo can be formed with Experiment Kraj, Gilder Bairn, Training Grounds, Clutch of Currents

Color identity: GU
Mana cost: {3}{U}
Steps:
  1. Activate the Forest or Island by tapping it, adding {G} or {U}.
  2. Cast Clutch of Currents for its awaken cost by paying {4}{U}, returning a creature to its owner hand, and causing the Forest or Island to become a 0/0 Elemental creature that is still a land, and putting three +1/+1 counters on it.
  3. Activate Experiment Kraj using the Forest or Island's ability by tapping it, adding {G/U}.
  4. Activate Experiment Kraj using Gilder Bairn's ability by paying {G/U} and untapping it, doubling the counters on target permanent.
  5. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite proliferate[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Experiment Kraj must be on the battlefield
  - Gilder Bairn must be on the battlefield
  - Training Grounds must be on the battlefield
  - Clutch of Currents must be in your hand
  - Experiment Kraj does not have summoning sickness.
  - Gilder Bairn has at least one +1/+1 counter on it.
  - You control at least one Forest or Island.
[END OF COMBO PREREQUISITES]
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