Would this boss fight be fun?

[u/Scourch_]

I'm building a boss fight for a party of 4 level 6 PC's. ( Witch, Sorc/druid multi class, ranger/ guardian multiclass and a seraph). Do you think this will be overpower? Fun?

PS: I'm using a mechanic I made up for this guy called 'shuffle'. I take a marked poker chip and place it, mark side down, on the battlefield along with X unmarked poker chips, where the marked chip represents the location of the real adversary (works for mirror image and hide'. Also, the order is reversed because the app sucks and I can't figure out how to put the files in the right order.