Gilder Bairn, Agatha's Soul Cauldron, and Selvala, Eager Trailblazer

Prerequisites

• Gilder Bairn in exile
• Agatha's Soul Cauldron on the battlefield
• Selvala, Eager Trailblazer on the battlefield

Steps

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

Results

• Infinite colored mana
• Infinite proliferate