Lost Jitte + Karn's Bastion + Cryptic Trilobite + Lae'zel, Vlaakith's Champion

Lost Jitte

Karn's Bastion

Cryptic Trilobite

Lae'zel, Vlaakith's Champion

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 loop creates an engine of exponential growth by turning Karn's Bastion into a self-sustaining mana generator. Lae'zel, Vlaakith's Champion supercharges the proliferation by adding an extra counter to everything whenever Karn's Bastion activates, allowing Cryptic Trilobite to gain more +1/+1 counters than it spends to fuel the process. Meanwhile, Lost Jitte converts those extra resources into an untap effect for Karn's Bastion, letting you cycle through the entire loop infinitely.