Gilder Bairn, Cryptolith Rite, and Biomancer's Familiar

Prerequisites

• Gilder Bairn on the battlefield
• Cryptolith Rite 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