There are four main rarities (common, uncommon, rare, and mythic rare) and each one has different needs when it comes to design
If you are really interested in Location cards, then Ruby/Sapphire is the deck youre going to want to get
The deck has a couple cards that, in my opinion, dont fit into the strategy so neatly
A hybrid of 60% sealed and 40% singles balances stability with upside
For rebacked cards you can usually use the bend test (which will usually cause the two pieces to separate a bit near the crease)
There is, however, a wrinkle on that front, as Brightglass GearhulkBrightglass Gearhulk is in green and white, and pretty much every combo involving Curiosity is not only in Izzet, but also directly involves an Izzet commander