The fact that a high-level WotC employee not only recognized these cards, but also happened to have one on an uncut sheet in his possession adds to the preponderance of evidence that the cards are indeed genuine products of WotC
That splash of red gets me access to Harsh Mentor and Rampaging Ferocidon, 2 great punishing cards
Like most Magic: The Gathering cards, the value of Archon of Cruelty depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Duskmourn: House of Horror Commander)
I dont know how good this Jafar will be, and Im not claiming it's a totally-busted-must-have card
For quick in-game decisions, I always keep in mind that roughly 7 times out of 10, Ill draw that third land