Its a card that can draw three cards on a kicker, and you can blink it or just delve eight cards from your graveyard to do it again
It clears out a graveyard when it enters, which is always handy, but Jirinas real strength lies in its sacrifice ability that gives all your humans hexproof and indestructible for a turn
Stoneforge Mystic no longer finds Colossus Hammer (or anything else), Archon of Cruelty is just a big flier and no longer wins the game for Creativity decks, Primeval Titan cant tutor up lands and gets blocked by Elesh Norn, Mother of Machines for days, Omnaths landfall ability doesnt trigger - the list of popular decks and cards that Elesh Norn stops is surprisingly long
Bringing the Booster Fun Work on Booster Fun involves a lot of talented people to make the treatments happen in each new set, some of whom you've been introduced to in the Innistrad: Midnight Hunt Booster Fun article
And as with any year, some of the precons were great, some were not so good, and many were in between
You can create a literal Zombie army of Hildibrand Mandervilles