Agatha's Soul Cauldron, Heroes' Bane, and Crystalline Crawler

Prerequisites

• Agatha's Soul Cauldron on the battlefield
• Heroes' Bane in exile
• Crystalline Crawler on the battlefield
• Crystalline Crawler has power 5 or greater and has at least one +1/+1 counter on it
• available

Steps

1. Activate Crystalline Crawler using Heroes' Bane's ability by paying , putting a number of +1/+1 counters on Crystalline Crawler equal to its power
2. Activate Crystalline Crawler's first ability four times by removing four +1/+1 counters from it, adding
3. Repeat

Results

• Infinite colored mana
• Infinite +1/+1 counters on Crystalline Crawler