Gilder Bairn, Agatha's Soul Cauldron, and Cradle Clearcutter

Prerequisites

• Gilder Bairn in exile
• Agatha's Soul Cauldron on the battlefield
• Cradle Clearcutter on the battlefield

Steps

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

Results

• Infinite green mana
• Infinite proliferate