Panoptic Mirror + Strionic Resonator + Ghostly Flicker + Stonespeaker Crystal

Panoptic Mirror

Strionic Resonator

Ghostly Flicker

Stonespeaker Crystal

How it works

1. At the beginning of your upkeep, Panoptic Mirror triggers.
2. Holding priority, activate Stonespeaker Crystal by tapping it, adding CC.
3. Activate Strionic Resonator by paying 2 and tapping it, copying Panoptic Mirror's trigger.
4. Resolve the copy of Panoptic Mirror's trigger, casting a copy of Ghostly Flicker without paying its mana cost.
5. Resolve the copy of Ghostly Flicker, blinking Stonespeaker Crystal and Strionic Resonator.
6. Repeat from step 2.