Gilder Bairn, Cryptic Trilobite, and Earthcraft

Prerequisites

• Gilder Bairn on the battlefield
• Cryptic Trilobite on the battlefield
• Earthcraft on the battlefield
• Cryptic Trilobite has at least two +1/+1 counters on it
• You control at least one basic Forest and/or Island
• available

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

• 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