With the new format I can’t tell what the rareity level is for the weapons that are on sale. I’m not opposed to paying for lower rareity weapons because they are super cheap to get to fully upgraded to unlock kindom levels.
I guess I wont be buying any weapons until the new graphics go back to the old way or a new layout comes out. 
Maybe checking the background or the stars around the magic stat:
red stars for doomed, yellow for legendary…
The background graphic behind the weapon art is still consistent with its rarity level, but it’s just not as convenient as the rarity-colored borders we had before.
The stars next to the weapon name in the middle of the card also match the rarity.