Getting to double the effects of expensive and X-cost spells for just a one-mana kicker is already some amazing fair value, especially when you can opportunistically copy Faithless Looting and other smaller spells in between the big stuff
The picture: here youll see the Pokmon itself, obvious clues to the rarity (such as whether it is holographic or not), and also whether you have a misprinted card (which can be very rare, mind you!)
These short-sell targets include: Jace, Vryns Prodigy (Foil) at $40+, Chandra, Fire of Kaladesh (Foil) at $40, Days Undoing at $14 and Kytheon, Hero of Akros at $14
I used to play Magic quite a bit, but I dropped it several years ago now
Sacrifice synergies abound with cards like Bag of Devouring, Mayhem Devil, and Juri, Master of the Revue