Gilder Bairn, Crystalline Crawler, and Earthcraft

Prerequisites

• Gilder Bairn on the battlefield
• Crystalline Crawler on the battlefield
• Earthcraft on the battlefield
• Crystalline Crawler has at least three +1/+1 counters on it
• You control at least one basic land
• if you control a basic Forest and/or Island, or available otherwise available

Steps

1. Activate a basic land by tapping it, adding
2. Activate Earthcraft by tapping Gilder Bairn, untapping the basic land
3. Activate the basic land by tapping it, adding
4. Activate Gilder Bairn by paying and untapping it, doubling each counter on Crystalline Crawler
5. Activate Crystalline Crawler's first ability twice by removing two +1/+1 counters from it, adding
6. Repeat from step 2
7. Once you have infinite +1/+1 counters on Crystalline Crawler, you may instead double the counters on any other permanent(s)

Results

• Infinite +1/+1 counters on Crystalline Crawler
• Infinite colored mana
• Infinite proliferate
• Infinite untap of basic lands you control