Activate Karn's Bastion by paying {4}, putting a charge counter on Lost Jitte and two +1/+1 counters on Cryptic Trilobite.
Activate Cryptic Trilobite's first ability twice by removing two +1/+1 counters from it, adding {C}{C}{C}{C} that can only be spent to activate abilities.
Activate Lost Jitte by removing a charge counter from it, untapping Karn's Bastion.
Repeat.

Infinite proliferate

Lost Jitte

Karn's Bastion

Cryptic Trilobite

Hardened Scales

Activate Karn's Bastion by paying {4}, putting a charge counter on Lost Jitte and Gemstone Array, and a +1/+1 counter on Cryptic Trilobite and Crystalline Crawler.
Activate Cryptic Trilobite's first ability by removing a +1/+1 counter from it, adding {C}{C} that can only be spent to activate abilities.
Activate Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding {1}.
Activate Gemstone Array's second ability by removing a charge counter from it, adding {1}.
Activate Lost Jitte by removing a charge counter from it, untapping Karn's Bastion.
Repeat.

Combos with "Lost Jitte"