This is Loki's scepter. You know all about it.
But in case you don't, it first appeared in The Avengers (2012), as a weapon given to him by Thanos to help him invade Earth. In Avengers: Age of Ultron (2015), we learn that it houses the Mind Stone inside its bauble.
It made its way into the comics in Loki: Agent of Asgard #16 (July 2015), although this one is just a modified version of Freyja's staff created by King Loki. (This particular image is from issue 17.)
I know they don't look exactly the same, but I think it's pretty clear the inspiration is there. Oh hey! I just realized kid Loki's jacket has the same weird half-zipper lapels that his movie outfits have. I'm not going to make a separate entry for that, but it's noted.