Holographic/Speed based technique

It's a bit of a weird title yea but I was hoping to hear some advice or criticism about a technique I created for a character in a dnd roleplay thing I'm in based off of jjk

Basically it's a sort of hologram type projection thing where the user can create objects out of tiny little cubes and use them as weapons or as platforms to help her, like creating a baseball bat to smack somebody with it or spawning a bunch of ranged weapons in the air and firing them, my favorite is where she just creates a car out of sight and just runs somebody over with it mid attack as a sort of combo extender, her domain expansion involves her creating a racetrack with ten hologram cars that damage the opponent and the user apon contact, if the opponent isn't fast enough they are given a vehicle by default to race but if they are fast enough they can run on foot. When reaching first place the winner gets an extremely powerful buff while anyone below 5th place gets damaged, anyone between 5-3 don't get any buffs or debuffs and 10-12th place is just instant game over. I don't have a name or super creative use for the technique yet (or a name for the domain) but it's supposed to be a flashy/speed based kind of thing so I'm open to any ideas anyone might have on fixing it or improving it.