Aphetto Exterminator is a uncommon Creature — Human Wizard card from Legions (LGN), collector number 59. Current market price: $0.15 (foil $0.75), TCGplayer market prices via Scryfall.
Morph {3}{B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) When this creature is turned face up, target creature gets -3/-3 until end of turn.