These special cards can appear in all boosters, and Id expect these to be really valuable due to the popularity of EDH
This version of Mana Crypt takes us back to Kaladesh for the style, which you can see both in the beautiful showcase frame, and from all the iconic red and gold filigree
Prevented attacks until Mikaeus, the Lunarch activations spoiled his triggered ability, at which point he could still block one a turn but couldn't kill anything anymore
Lost Jitte Magic formats that dont have access to Umezawa's Jitte like Modern can use Lost Jitte as a different value source for decks like Eldrazi Tron that may value the repeatable untap ability
My take was that Skullclamp was still relevant enough to RW tokens decks that throwing an anthem onto an Impact Tremors was actually a bit of a disadvantage
He can defend himself, isnt terribly over-costed, and lets you ramp into end-game creature options