the professor mtg card Onyx – Proxy R Us 6 Toughness Postmortem Professor [SGL-MTG-SOS2-327-ENF]

There are three versions of the card that appear in the set

(4/26/2014) If the copied creature has in its mana cost, X is considered to be 0

Additionally, if you have an item deck, you can pay one less ink for any Inventor character in your hand while shes on the table with a host of items

(2023-06-16) The Ring can tempt you even if you don't control a creature

It suits the decks play style and the clues are perfect for triggering Sphinx's Tutelage I haven't honestly tested this enough yet and I'm not going to have much time to practice, there's less then a week left before the Grand-Prix and I sometimes do other things with my time