Gilder Bairn, Agatha's Soul Cauldron, and Rofellos, Llanowar Emissary

Prerequisites

• Gilder Bairn in exile
• Agatha's Soul Cauldron on the battlefield
• Rofellos, Llanowar Emissary on the battlefield

Steps

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

Results

• Infinite green mana
• Infinite proliferate