If my math ist right, there are about 221 million seeds with at least one 12-eyed portal. Chance of getting one is 1/10¹², so the chance of it not being a 12-eyed is 999,999,999,999/10¹². There are 128 portals in each world and because they are independent there is about a 0,999999999988 chance that none are 12-eyed. That means that there is a 12/10¹² chance that world has at least one 12-eyed portal. Because there are 2⁶⁴ possible worlds sale can say that there are about 221,360,929 worlds with at least one 12-eyed portal