Maybe Im showing my age and this card wont appeal as broadly as it does to me, but is the card that has the best ratio of cool factor to general playability in the set by my standards, which makes it my pick for the card that adds the most to the wide world of Cube
Caradora, Heart of Alacria Caradora, Heart of Alacria puts an artifact/creature tutor and an Ozolith, the Shattered Spire in your command zone
Spot Removal In addition to ramping so we can cast spells on time (or early enough in the game to still be relevant), decks need removal to deal with the threats that opposing decks present, as well as to be able to protect their own threats from opposing removal
Illustrated by Vincent Proce Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
Perhaps going heavier Blue would have been better, as it seems to be the only color that allows you to draw cards reliably (along with Black)
This test is easy to do with your phone, and reliable in the sense that a card that fails is practically guaranteed to be fake