Gilder Bairn, Ashaya, Soul of the Wild, and Druids' Repository

Prerequisites

• Gilder Bairn on the battlefield
• Ashaya, Soul of the Wild on the battlefield
• Druids' Repository on the battlefield

Steps

1. Activate Ashaya by tapping Gilder Bairn, adding one mana
2. Activate Gilder Bairn by paying and untapping it, doubling each counter on Druids' Repository
3. Activate Druids' Repository 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 Druids' Repository, you may instead double the counters on any other permanents

Results

• Infinite proliferate for permanents
• Infinite colored mana