Agatha's Soul Cauldron, Myojin of Towering Might, Tekuthal, Inquiry Dominus, and Cryptic Trilobite

Prerequisites

• Agatha's Soul Cauldron on the battlefield
• Myojin of Towering Might in exile
• Tekuthal, Inquiry Dominus on the battlefield
• Cryptic Trilobite 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 five +1/+1 counters on Cryptic Trilobite, and three +1/+1 counters on any creature you control
2. Activate Cryptic Trilobite's first ability twice by removing two +1/+1 counters from it, adding that can only be spent to activate abilities
3. Activate Tekuthal by paying and removing three +1/+1 counters from Cryptic Trilobite, putting an indestructible counter on it
4. Repeat

Results

• Infinite +1/+1 counters
• Infinite colored mana that can only be spent to activate abilities of creatures you control
• Infinite colorless mana that can only be spent to activate abilities