You have a certain chance to hit the mythic, but then you are 50/50 on which version youre going to get, making each version half as common
Some cards, usually Backgrounds themselves, refer to "commander creatures." Those don't refer to a Background enchantment that is a commander unless it is also a creature
This card has only one see one non-bonus sheet reprint, and that was with the upgraded rarity of mythic rare in the compilation set Dominaria Remastered , so its not shocking to see this reasonably costed protective enchantment sit above a price point of $15 roughly 25 years after it released
Its trivial to set up a winning sequence by casting this and following it up the next turn with Craterhoof Behemoth or another Overrun effect
I started playing during this period and if an opponent had their legendary creature in play already, it meant you effectively couldnt get your copy into play
Salt-o-Meter : Angel Tears #16