Clever Impersonator
Where Clone stopped at creatures and Copy Enchantment at enchantments, this answered the obvious question the type-restricted clones kept skirting: what if the copy effect simply did not care what it pointed at? Any nonland permanent on the battlefield is fair game, so the same card can arrive as the best creature in play, the planeswalker an opponent just resolved, a mana rock, an enchantment lock piece, or a token from three turns ago. The cost of that reach is structural rather than textual: a clone is only as good as what already exists on the board, which makes this a reactive spell that punishes casting it into an empty field and rewards holding it until something worth becoming has landed. The double-blue commitment marks it as the premium-rate version of the open-ended copy effect, a cleaner successor to a long line of clones that each carved off one slice of the permanent-type chart. The replacement effect chooses its copy as the creature enters rather than targeting, which matters: nothing goes on the stack to be countered or redirected, and hexproof or shroud on the chosen permanent is no obstacle. The "may" is the pressure valve; copying is optional, so entering with nothing worth becoming leaves a 0/0 that dies to state-based actions the moment it hits the battlefield. Copying steals nothing, either. The opponent's permanent stays put, and you simply gain a second instance, generating parity on the strongest thing in play rather than removing it.
