At the beginning of your upkeep, Panoptic Mirror triggers.
Holding priority, activate The Great Henge by tapping it, adding and causing you to gain 2 life.
Activate Strionic Resonator by paying 2 and tapping it, copying Panoptic Mirror's trigger.
Resolve the copy of Panoptic Mirror's trigger, casting a copy of Ghostly Flicker without paying its mana cost.
Resolve the copy of Ghostly Flicker, blinking The Great Henge and Strionic Resonator.
Repeat from step 2.
This intricate loop turns Panoptic Mirror into a recurring engine by imprinting it with Ghostly Flicker, allowing its upkeep trigger to cast the spell for free. To keep the cycle going indefinitely, Strionic Resonator steps in to duplicate that trigger so you can respond and recast the flicker, while The Great Henge provides the crucial green mana needed to activate the Resonator while conveniently netting you infinite life and tapping for {G}{G}. As these artifacts blink back and forth across the battlefield, you generate infinite storm count, infinite magecraft triggers, and an unstoppable cascade of lifegain.