Ertha Jo, Frontier Mentor + Clock of Omens + Pheres-Band Tromper + Encroaching Mycosynth

Ertha Jo, Frontier Mentor

Clock of Omens

Pheres-Band Tromper

Encroaching Mycosynth

How it works

1. Activate Clock of Omens by tapping it and Pheres-Band Tromper, targeting Pheres-Band Tromper.
2. Ertha Jo triggers, copying Clock of Omens' ability, targeting Clock of Omens.
3. Resolve both Clock of Omens abilities, untapping it and Pheres-Band Tromper.
4. Pheres-Band Tromper triggers, putting a +1/+1 counter on it.
5. Repeat.

This clever loop turns a modest untap engine into infinite growth by using Encroaching Mycosynth as the ultimate enabler, turning every nonland permanent you control—including Pheres-Band Tromper itself—into an artifact. With that artifact foundation laid, Clock of Omens can tap the Tromper along with any other artifact to untap the Tromper, triggering its inspired ability to stack endless +1/+1 counters. The true alchemical catalyst here is Ertha Jo, Frontier Mentor, who watches you activate Clock of Omens and promptly copies the ability, allowing you to untap both the Clock and the creature simultaneously to keep the loop spinning forever.