Gilder Bairn, Agatha's Soul Cauldron, and Topiary Lecturer

Prerequisites

• Gilder Bairn in exile
• Agatha's Soul Cauldron on the battlefield
• Topiary Lecturer on the battlefield

Steps

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

Results

• Infinite green mana
• Infinite proliferate