Genku, Future Shaper + Crystalline Crawler + Cryptic Trilobite + Benevolent Hydra

Genku, Future Shaper

Crystalline Crawler

Cryptic Trilobite

Benevolent Hydra

How it works

1. Activate Genku by paying 3, putting two +1/+1 counters on each creature you control due to Benevolent Hydra.
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 fascinating loop transforms the counter-manipulation engines of Crystalline Crawler and Cryptic Trilobite into a self-sustaining mana and growth machine, amplified heavily by the static replacement effects of Benevolent Hydra. As you spend and replace the counters fueling this engine, Genku, Future Shaper anchors the ecosystem by generating valuable creature tokens whenever its prerequisites are met. By cycling these activations back into Genku, Future Shaper's activated ability, you continually expand your board state while generating infinite colorless mana specifically restricted to abilities and infinite +1/+1 counters across your creatures.