Gilder Bairn, Agatha's Soul Cauldron, and Doc Samson, Super Psychiatrist

Prerequisites

• Gilder Bairn in exile
• Agatha's Soul Cauldron on the battlefield
• Doc Samson, Super Psychiatrist on the battlefield

Steps

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

Results

• Infinite colored mana
• Infinite proliferate