How can you create a combo with Gilder Bairn, Cryptic Trilobite, Earthcraft?
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[START OF COMBO]This combo can be formed with Gilder Bairn, Cryptic Trilobite, Earthcraft

Color identity: GU
Mana cost: {1}
Steps:
  1. Activate a basic Forest or Island by tapping it, adding {G/U}.
  2. Activate Earthcraft by tapping Gilder Bairn, untapping the basic Forest or Island.
  3. Activate the Forest or Island by tapping it, adding {G/U}.
  4. Activate Gilder Bairn by paying {2}{G/U} and untapping it, doubling each counter on Cryptic Trilobite.
  5. Activate Cryptic Trilobite's first ability by removing a +1/+1 counter from it, adding {C}{C} that can only be spent to activate abilities.
  6. Repeat from step 2.
  7. Once you have infinite +1/+1 counters on Cryptic Trilobite, you may instead double the counters on any other permanent(s).[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters on Cryptic Trilobite
  - Infinite colorless mana that can only be spent to activate abilities
  - Infinite proliferate
  - Infinite untap of basic lands you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Cryptic Trilobite has at least two +1/+1 counters on it.
  - You control at least one basic Forest and/or Island.
[END OF COMBO PREREQUISITES]
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