Gilder Bairn, Ashaya, Soul of the Wild, and Biomancer's Familiar

Prerequisites

• Gilder Bairn on the battlefield
• Ashaya, Soul of the Wild on the battlefield
• Biomancer's Familiar on the battlefield
• Gilder Bairn does not have summoning sickness

Steps

1. Activate Gilder Bairn by tapping it, adding
2. Activate Gilder Bairn by paying and untapping it, doubling each counter on target permanent
3. Repeat

Results

• Infinite proliferate