Tromell, Seymour's Butler, Gemstone Array, and Crab Umbra

Prerequisites

• Tromell, Seymour's Butler on the battlefield
• Gemstone Array on the battlefield
• Crab Umbra on the battlefield
• available

Steps

1. Activate Tromell by paying and tapping it, causing you to put at least five charge counters on Gemstone Array
2. Activate Gemstone Array five times by removing five charge counters from it, adding
3. Activate Crab Umbra by paying , untapping Tromell
4. Repeat

Results

• Infinite colored mana
• Infinite charge counters on Gemstone Array
• Infinite proliferate