originally, there were 3
rare
uncommon
common
then they added mythic
however, rarity tier won't give a good estimation of value, aside from maybe a ceiling
note the badgermole cub, both rated "M" for mythic (bottom left)
left one is about twice the price of the right because it's a borderless foil, while the right is the standard print
unlike pokemon in this regard which tells you the variant in the rarity
And rarity tears