There are 6 rares and 1 mythic rare in the borderless frame break treatment (0.8% in total), 2 rares and 2 mythic rares in the borderless profile treatment (0.3% in total), 2 rares and 1 mythic rare in a retro frame (0.2% in total), and 1 additional borderless mythic rare (less than 0.1%)
Plus, its in GW, which are colors related to enchantment/aura decks
This was a deviation from the stated goal of pretending that there'd been six colors since the beginning, but it was inevitable because we needed a way to get the lands out to the casual crowd
Each set has something specific you can look for to work your way through the revised MTG forensic ID flowchart to correctly identify just what youre looking at: The chart essentially goes through a checklist in order of border color, the date on the card (if any), and the language the card is in
How you keep your cards straight