Illusioner Chess
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Every side has an Illusioner from the start: you can choose what it will “illusion” into. It can be a knight or a pawn or a queen or anything else other than a king. At first, it behaves like the piece it is, but as it is captured, its status would be “revealed” which turns it into something that looks like a cloak for a move. During that time it is revealed, it can be taken and it moves like a king. If its status clears, the spot that the Illusioner had once occupied becomes the original piece that it had illusioned into. You then have to get another piece for it to illusion into, which is not the one that it had been the last time.