I really like the new button to toggle mythic cards on/off; along with the search and mana toggles in the collection it has helped in sorting cards. However, I think it would also be helpful to make mythic a searchable keyword. I suspect I am not the only player who disenchants mythics for the memoria, and it would be great to have a way to show ONLY mythics rather than scrolling through the full collection.
Also, it might be helpful to show a few more stats on decks besides average faeria cost. Curve and qty of creatures/events/structures would be very useful.