White Cards are used to remove your opponents cards and bolster your defenses for their attacks
Stoneforge Mystic no longer finds Colossus Hammer (or anything else), Archon of Cruelty is just a big flier and no longer wins the game for Creativity decks, Primeval Titan cant tutor up lands and gets blocked by Elesh Norn, Mother of Machines for days, Omnaths landfall ability doesnt trigger - the list of popular decks and cards that Elesh Norn stops is surprisingly long
5 - N's Reshiram (Illustration Rare Promo Logo - 167/159) This card, in particular, features the set's logo, as shown below: This beautiful card is included in the special Booster Box, Enhanced Box , which is the main way to get it
The same thing happens in design
Using companions gives you a material reward for your sacrifice, AND shows off what youre doing right from the start so your opponents can appreciate it
However, grading carries risk, costs money, and requires experience to evaluate card condition properly