TAHK0 speculated on why the error may have happened, writing, Poke Balls went through a lot of early variations, with everything from the button placement changing, to how it opens differing, to even being depicted with the white on top. It could be that an early Pok Ball design actually did open like it does on the card back, but when the design was eventually changed to the opposite way, they forgot to update it on the card back before going to print, and it remains that way to this day
3: Exile target creature or enchantment you don't control until target enchantment you control leaves the battlefield
The glimpses were brief, and the features were seemingly animated, however
It also has a useful amount of fluidity with a Retreat Cost of just one
Treasures are obviously much more versatile than a one-time bump of a black mana, and then theres that whole you win the game clause tacked onto the end