Kathyrix, Faceless Matron

Kathyrix enters the battlefield as a copy of target creature, except its name is Kathyrix, Faceless Matron, it's legendary and a Shapeshifter in addition to its other types
and has "At the beginning of your upkeep,
you may exile target creature you control. If
you do, return it to the battlefield at the beginning of the next end step."