My collection is getting quite sizeable now, and since the design decision was taken to make rares and mythics so much more powerful than commons and uncommons, many of my cards are what I would consider to be unplayable.
I’m not here to attack that decision (not today, anyway), but it would be nice when I’m building decks not to have to look at pages and pages of Hitchclaw Recluses, Knights of the Pilgrim’s Road, Runed Servitors, Stone Haven Medics, Chaplain’s Blessings, Explosive Apparati, Aerial Volleys, Caustic Caterpillars, Kessig Dire Swines… the list goes on and on.
What would be nice would be if I could save my own custom filters to filter out those cards that I consider to be unplayable. Other people could save different custom filters depending on the state of their collection. I bet when I built Ajani decks with my own filter, the deck editor would be waaay below the 38 pages I have to scroll through now.