Genku, Future Shaper + Crystalline Crawler + Cryptic Trilobite + Primal Vigor

Genku, Future Shaper

Crystalline Crawler

Cryptic Trilobite

Primal Vigor

How it works

1. Activate Genku by paying 3, putting two +1/+1 counters on each creature you control due to Primal Vigor.
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 elegant loop relies on scaling up our resources through exponential growth, perfectly orchestrated by Genku, Future Shaper and Primal Vigor. While Genku's triggered ability lets us cycle through token types when our permanents leave, his activated ability—doubled by Primal Vigor—heavily pumps our board with counters, which in turn fuels our mana engines. Crystalline Crawler and Cryptic Trilobite serve as the dynamic duo of the setup, converting those doubled +1/+1 counters back into the exact colored and restrictive mana needed to pay Genku's activation cost and sustain the loop indefinitely.