By turning all nonbasic lands into Mountains, Blood Moon has the potential to either stall or completely devastate your opponents mana base depending on the deck theyre playing
Also key to an Amber/Ruby deck is including Lilo: Making a Wish, Stitch: New Dog, and Stitch: Rock Star, a powerful trio in Amber aggro decks that can start racking up lore very quickly, as well as the 2 cost Bodyguard Simba: Protective Cub
The List is a crucial source of reprints in MTG, but the selection of cards included will soon look very different
Counters remain on a permanent while its phased out
Black: Kayas Ghostform, Malakir Rebirth, Undying Malice, Feign Death, etc
The most important note I can leave you on is to always prioritize the goals of your sideboard