Instants & Sorceries - 18
The Pokmon Company has not yet revealed how much the new set will cost
While that might not seem too complicated either, Last Turns wording and effect have caused a plethora of ruling questions, so much so that it has become a nightmare for trained judges to explain accurately
If you stick solely to Vampire Aristocrats like the precon promotes then I think Clavileno and Carmen are about the same power level where it boils down your own preferences and your own meta: Clavileno is cheaper and provides a slow but consistent payoff, whereas Carmen is more expensive but also more explosive and randomly becomes more powerful if you happen to play against decks that sacrifice a lot (fetchlands, treasures, other Aristocrats etc.)
Investigators Journal Mazemind Tome saw a lot of play throughout its time in Standard and while Investigator's Journal is not guaranteed to draw three cards each time, in certain matchups it can potentially do more than that
Mega Gardevoir has long held a dedicated following across multiple generations, and this Ultra Rare version reinforces that legacy