Agent Frank Horrigan + Cryptic Trilobite + Emiel the Blessed

Agent Frank Horrigan

Cryptic Trilobite

Emiel the Blessed

How it works

1. Activate Emiel the Blessed by paying 3, blinking Agent Frank Horrigan.
2. When Agent Frank Horrigan enters the battlefield, it triggers, causing you to put two +1/+1 counters on Cryptic Trilobite.
3. Activate Crystalline Crawler's first ability twice by removing two +1/+1 counters from it, adding CCCC that can only be spent to activate abilities.
4. Repeat.

This engine relies on looping Agent Frank Horrigan's entry trigger to endlessly multiply counters, fueled entirely by Emiel the Blessed's repeatable blink ability. As Agent Frank Horrigan blinks back onto the battlefield, its double-proliferate ability triggers to continuously grow Cryptic Trilobite, which supplies the exact mana needed to keep the cycle going.