Gilder Bairn, Crystalline Crawler, and Utopia Vow

Prerequisites

• Gilder Bairn on the battlefield
• Crystalline Crawler on the battlefield
• Utopia Vow on the battlefield

Steps

1. Activate Gilder Bairn using its ability from Utopia Vow by tapping it, adding one mana
2. Activate Gilder Bairn by paying and untapping it, doubling each counter on Crystalline Crawler
3. Activate Crystalline Crawler as many times as necessary by removing counters from it, adding at least two mana
4. Repeat from step 2
5. Once you have infinite counters on Crystalline Crawler, you may instead double the counters on any other permanents

Results

• Infinite colored mana
• Infinite proliferate for permanents
• Infinite +1/+1 counters on a creature