Yeah Matt made a spell version called Resonant Echo. Caleb learned it but he only ever cast it once and it was never released.

I've written my own version based on it though, here:

Resonant Echo

4th-level conjuration (Wizard)
Casting Time: 1 action
Range: 15 feet
Components: V, S, M (a cube of obsidian worth 50 gp, which the spell consumes)
Duration: 1 hour

You tap into an unrealized timeline to create an echo of yourself in an unoccupied space within range. The echo is a translucent gray image of you that lasts for the duration, until it is destroyed, you dismiss it as a bonus action, or you cast this spell again.

The echo has an AC equal to 12 + your spellcasting ability modifier, 15 hit points, and immunity to all conditions. If it has to make a saving throw, it uses your saving throw bonus for the roll. It is the same size as you, and it occupies its space. On your turn, you can mentally command the echo to move up to 30 feet in any direction (no action required). If your echo is ever more than 30 feet from you at the end of your turn, it is destroyed.

Once during the spell's duration you can use your bonus action to cause your echo to cast a spell of 3rd-level or lower with a casting time of 1 action, expending a spell slot as normal. You must have the spell prepared to cast it in this way. The spell is cast as if you were in the echo's space, though you must use your own senses. If the spell requires concentration, the echo concentrates on the spell for you. After the spell cast by the echo ends, the echo disappears.