Agatha's Soul Cauldron, Myojin of Towering Might, Tekuthal, Inquiry Dominus, and Crystalline Crawler

Prerequisites

• Agatha's Soul Cauldron on the battlefield
• Myojin of Towering Might in exile
• Tekuthal, Inquiry Dominus on the battlefield
• Crystalline Crawler on the battlefield
• Tekuthal has at least one indestructible counter on it, and at least one +1/+1 counter on it

Steps

1. Activate Tekuthal using Myojin of Towering Might's ability by removing an indestructible counter from it, putting six +1/+1 counters on Crystalline Crawler, and two +1/+1 counters on any creature you control
2. Activate Crystalline Crawler's first ability three times by removing three +1/+1 counters from it, adding
3. Activate Tekuthal by paying and removing three +1/+1 counters from Crystalline Crawler, putting an indestructible counter on it
4. Repeat

Results

• Infinite +1/+1 counters
• Infinite colored mana