Gilder Bairn, Agatha's Soul Cauldron, and Loot, the Nexus

Prerequisites

• Gilder Bairn in exile
• Agatha's Soul Cauldron on the battlefield
• Loot, the Nexus on the battlefield

Steps

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

Results

• Infinite colored mana
• Infinite proliferate