Lost Jitte + Karn's Bastion + Cryptic Trilobite + Primal Vigor

Lost Jitte

Karn's Bastion

Cryptic Trilobite

Primal Vigor

How it works

1. Activate Karn's Bastion by paying 4, putting a charge counter on Lost Jitte and two +1/+1 counters on Cryptic Trilobite.
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 Lost Jitte by removing a charge counter from it, untapping Karn's Bastion.
4. Repeat.

This clever loop achieves infinite proliferation by turning Karn's Bastion into a self-sustaining engine, fueled entirely from within. Cryptic Trilobite acts as your mana source, feeding on its own +1/+1 counters to generate the colorless energy needed to activate the Bastion, while Primal Vigor doubles those counters to ensure the Trilobite never runs dry. Meanwhile, Lost Jitte passively collects the charge counters produced by the Bastion's proliferation and spends them to untap the land, resetting the loop for another iteration.