Gilder Bairn, Gemstone Array, and Earthcraft

Prerequisites

• Gilder Bairn on the battlefield
• Gemstone Array on the battlefield
• Earthcraft on the battlefield

Steps

1. Activate a basic land by tapping it, adding one mana
2. Activate Earthcraft by tapping Gilder Bairn, untapping the basic land
3. Activate the Forest or Island by tapping it, adding one mana
4. Activate Gilder Bairn by paying and untapping it, putting at least three charge counters on Gemstone Array
5. Activate Gemstone Array twice by removing two charge counters from it, adding
6. Repeat from step 2
7. Once you have infinite counters on Gemstone Array, you may instead double the counters on any other permanents

Results

• Infinite charge counters on a permanent
• Infinite colored mana
• Infinite proliferate for permanents