Chaos Orb How is a card that is banned in every format it's legal in, and unreliable like this, worth more than $500 played for it's cheap Unlimited version
If you exiled a nonland card this way, create a Treasure token. More creatures is good, and Treasure tokens are famously absurd, so this seems like a great card in Lost Caverns of Ixalan
Return the Favor Return the Favor is a slick trick that any deck with a red commander wants access to
The Walking Dead set of cards was originally released as a part of a timed-exclusive Secret Lair, and remained the only way to get them until Wilds Of Eldraine almost three years later, where they were reprinted with in-universe Magic characters in Magic settings
The surprise play as an Instant would have made it awesome.
4 Massacre Girl, Known Killer (Showcase) (Invisible Ink) Foil Value - $38.12 A delightfully wicked update to the character only known as Massacre Girl, Known Killer, this card takes her -1/-1 trick from her days in War of the Spark and gives it a permanent upgrade in Murder at Karlov Manor