Global card search lists formats any given card is legal jn
When you search for cards, it is always under the filter of a particular format. I admit this makes sense in the majority of cases. But I am building a deck with a theme, dragons. I'd love to see all the crazy historic dragon cards out there, and know which ones are playable in Standard, Alchemy, Explorer, etc. This could be a way to convince me to try a new format like "I'd love to build a deck with these cards, but it looks like they're too old for Standard. Maybe I'll try Explorer!"
The other thing that keeps happening to me is that I read or hear about a card, but then that card is no longer legal in Standard/Alchemy, so I have to run a search in each other format to see where it's legal (search, wait, open filter screen, change format, wait, close filter screen, wait...). As a new player, I'm not familiar with old sets or their icons. So seeing a card, even know which set it's from, does little to inform me.
This search would be as easy as adding a new button or filter to the deck builder interface, similarly to how I can check a box to show cards I don't own. Or maybe there's an option in the format drop down menu. Or hey, maybe it's a whole new interface. Anything, please.