Offered to D23 attendees months before The First Chapters release as part of the D23 Expo Collectors Set, which included seven cards with unique artwork and a holographic finish, the Elsa, Snow Queen promo card has gone on to sell for thousands of dollars, becoming one of the most expensive Disney Lorcana cards to date
This means you can score up to 11 booster packs for most sets, and up to 35 boosters for Murders of Karlov Manor, Outlaws of Thunder Junction, Modern Horizons 3, and Duskmourn: House of Horror
Callous Oppressor made attacking and blocking nearly impossible for an opponent if they didn't name wisely when it came into play
Mishra's Bauble provides a 0-mana cantrip and a bit of information
There are plenty of cards that can bring creatures out from the graveyard to your side of the battlefield such as Virtue of Persistence, The Cruelty of Gix (which can also act as a tutor), Grave Betrayal, and Ashen Powder