As an example today I got Rhythm of the Wild from a TMNT pack. As I am a new player and play in Standard with cards I'm familiar with so far I don't dabble much in Historic. The new deck builder defaults to standard, so it was kind of hard to find this card I owned and wanted to play. I'm sure there are others I might have forgotten in winning styles from Midweek Magic, opening them in a pack, or purchasing them when they were on sale in the store.

These are cards I would potentially spend my wildcards on if I felt like playing a fancy version of deck built around playing what I own, or even just neat to look at. It seems like an obvious addition to the game because it would inspire players to build new decks and try different game play styles.