Think Skullbriar, the Walking Grave, but for a variety of different effects like losing abilities, permanent stat increases, etc
The reason for that one in particular was that some decks need answers to things like Moat, and also because it probably is the most old school card there is
Furthermore, there's a serious question of if Treasure Cruise is even a better card than Murktide Reagent, as the two cards both are battling for the same resource
You want to focus on big, impactful creatures that really shake up the board state upon entering the field, and who can continue to disrupt the game as long as they are on the field (or, possibly, by coming back from your Graveyard again, and again, and again) Protecting Yourself from an Early Grave, and Knowing Your Match-ups Reanimator decks also dip into forms of spot removal
I found this on Reddit, so I don't recall it being in the Japanese patch notes