Genku, Future Shaper + Crystalline Crawler + Cryptic Trilobite + Innkeeper's Talent

Genku, Future Shaper

Crystalline Crawler

Cryptic Trilobite

Innkeeper's Talent

How it works

1. Activate Genku by paying 3, putting two +1/+1 counters on each creature you control due to Innkeeper's Talent.
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 loop relies on the doubling power of Innkeeper's Talent to turn mana-producing counters into a surplus every time Genku, Future Shaper's pump ability is activated. You spend the mana generated by peeling counters off Cryptic Trilobite and Crystalline Crawler to fund Genku, Future Shaper's ability, which Innkeeper's Talent supercharges to place twice as many +1/+1 counters back on your creatures. Cryptic Trilobite and Crystalline Crawler happily supply the fuel by converting those fresh counters right back into mana, letting you continually scale your board and your mana pool.