Genku, Future Shaper + Crystalline Crawler + Cryptic Trilobite + Conclave Mentor

Genku, Future Shaper

Crystalline Crawler

Cryptic Trilobite

Conclave Mentor

How it works

1. Activate Genku by paying 3, putting two +1/+1 counters on each creature you control due to Conclave Mentor.
2. Activate Cryptic Trilobite's first ability twice by removing two +1/+1 counters from it, adding CCCC that can only be spent to activate abilities.
3. Activate Crystalline Crawler's first ability twice by removing two +1/+1 counters from it, adding .
4. Repeat.
5. Once you have infinite C, you may forego removing counters from Cryptic Trilobite.

This clever loop transforms simple counter manipulation into an engine of continuous growth and mana generation. By paying into Genku, Future Shaper, you trigger Conclave Mentor's replacement effect to load up your board with extra +1/+1 counters. You then harvest those counters using Crystalline Crawler and Cryptic Trilobite to easily refund the activation cost while generating a surplus of specialized mana, leaving you with infinite counters and resources.