That applies to Standard, Modern, Pioneer, and other popular constructed play formats
Some were originally shown as P1 in promotional images, but the Challenge promo cards from Season 1 used the C1 set label
And watch, my queen, hell do as I please! Illustrated by Pauline Voss Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
The deck hasnt been relevant in the Modern meta for a while, but cards that call back to it are still being printed
Kudos to you on your graduation
Being able to bestow the storm keyword on the next instant or sorcery spell you play after combat (as long as Storm damages your foe) is a truly astounding effect, so its no wonder that Storms face card will cost a princely sum