Not a fan of this at all, never mind adding it to the shop. There are already plenty of interesting and powerful items in the shop, we don't need more, even if it also required earning wishpoints to use effectively. Being able to generate 8 of a particular creature each reset for a wishpoint is insane. That is potentially 24+ each year?
I also don't understand this notion, why everything should be available to everyone, equally - what is wrong with having something being difficult, scarce, or otherwise not available? Is that not part of the value and desirability? Not only that, there are plenty of chances to earn these things now - hell just login in for a year straight if you want a semi-rare creature, use that wish!
We've already seen what happens when you make something more available, in gold and silver coins... It just made them worth less and nowhere near as desirable as before.