Well now with the new beasties this week I have some work to do, I am 3 shy of full. When I first started I thought that adding a rarer hybrid would effect the outcome. I would add a fairy ferret instead of panda with the pyro pony. Then I would replace it with a Simian to try for a vinotaur. I was incredibly lucky as I was so successful I was convinced that worked. I have always been lucky but I came to realize it does not work that way. At least I do not think it does now after hundreds of tries. I did speed breed just so everyone knows.
I hit a wall with the dark super rares. It seems like the more I tried for a specific beastie the more I would fail common. Omg the hordes of raccoons, foxes, and armordilos are too many to count. What ended up working for me was I got lucky enough to get a sea drake. I have only ever got one of those and one Pegasus. That eliminated water from the elements at the time so all that was left was the remaining three dark element super rares. So I started trying for a unicorn instead. I used any combination of dark, fire, nature, and rock. I seem to favor putting a fox on one side because I do not get a lot of foxes for some reason that way. You will fail raccoons though, just as bad. So instead of targeting one I was targeting all three, and I was also targeting the unicorn.
What I have found out is you can get any combination of what you put in. In some instances only one element might come out but that is only when using at least one ultra. So you will generally get any combination of the four elements you put in but it seemed to me that with dark and fire on one side I was less likely to end up with dark and fire. That is just me thinking out loud and I am sure I am wrong but it seemed to work out that way most of the time. So I will always get a combination of dark green, dark rock, fire green, fire rock, green rock, and dark fire. You can manipulate the creatures on each side and see if that works for you, but there is really no right way.
It really is a random number generator though. Imagine it randomized the 4 elements and picks two totally by chance, or a .5% it is a crystal unicorn. It then re-rolls for all animals with that combination. Let's say for example it selects dark and fire. In this example lets say there are 100 numbers. A random number between 1 and 100 is generated. If it is between 1 and 50 it is a fox, if it between 51 and 80 it is a bear, 81 to 90 now an ox, 91 to100 a phoenix. That's how it really works. Every thing else is just a forum fable. I am sure the numbers are different because that was just an example.
I will not lie, you will still get a lot of commons, but you will also start to upgrade your duplicates with rares. I got a lot of owls, moths, and later griffins, when I added water back in. They are good earners so be happy for those duplicates, level them to lvl 6 before food is too expensive for a duplicate. As you fill up, you keep upgrading your rare duplicates to bottom tier supers and you start making good money that way.
In the end I got most of my dark supers when I stopped trying to target one and targeted all of them with four element breeding. That has been my experience.
Here are my supers
Top tier - not too many
Sea drake 1
Pagasus 1
Gargolem 3
Phoenix 2
Ox 1
Bottom tier - lotta these
Vinotaur 2
Grasssquatch 4
Griffin 5
Magmacore 2
Owl 2
I divide them based on earnings. I do not count battle critters as I did not breed them.