Sometimes powerful cards like Liliana of the Veil get MTG reprints in new formats, offering a significant shift in the meta game
Additionally, physical jobs will increase their PA at a faster rate through leveling up than magical jobs will increase their MA, as the only non-special job that has an above-average MA growth is the unconventional Mime which can't be used as a traditional magic unit, whereas most of the non-special physical jobs have a higher growth rate in PA
It can't get any rarer than this - when only one copy of a given card exists, you know it's uniquely special
As a result, Be Prepared is played in just about every single Ruby deck
For specific match-ups, this is how Ive been sideboarding with the current list: Mono-Red On the Draw: -1 Shanna, Sisays Legacy, -3 Song of Freyalise, -2 Trostani Discordant