Requires

Gilder Bairn must be on the battlefield. Cryptic Trilobite must be on the battlefield. Earthcraft 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. Mana needed:

Steps

1. Activate a basic Forest or Island by tapping it, adding .
2. Activate Earthcraft by tapping Gilder Bairn, untapping the basic Forest or Island.
3. Activate the Forest or Island by tapping it, adding .
4. Activate Gilder Bairn by paying 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 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).

Results