They see a ton of play in fast formats like Legacy or Pauper where tempo matters most
Plenty of other durdly EDH uses for this white creature, as well
This deck existed in a unique spot in the format
Notably, opponents can't try to remove historic permanents you control from the battlefield at that time
(To scry X, that player looks at the top X cards of their library, then put any number of them on the bottom and the rest on top in any order.) As the enters-the battlefield ability resolves, first you scry 2
Since his release in 2019, he has been one of the most ubiquitous Black cards in the format, showing up in practically every deck that cares about sacrificing Creatures, reanimating Creatures, discarding Creatures or forcing opponents to discard Creatures, or Milling Creatures, which is about 90% of Black decks