Gilder Bairn, Agatha's Soul Cauldron, and Llanowar Tribe

Prerequisites

• Gilder Bairn in exile
• Agatha's Soul Cauldron on the battlefield
• Llanowar Tribe on the battlefield

Steps

1. Activate Llanowar Tribe by tapping it, adding Activate Llanowar Tribe using Gilder Bairn's ability by paying and untapping it, doubling the counters on target permanent
2. Repeat

Results

• Infinite proliferate