Gilder Bairn, Agatha's Soul Cauldron, and Bloom Tender

Prerequisites

• Gilder Bairn in exile
• Agatha's Soul Cauldron on the battlefield
• Bloom Tender on the battlefield

Steps

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

Results

• Infinite mana of colors among permanents you control
• Infinite proliferate