Sadly, it's all luck. I have been trying for the Panda almost exclusively since all those Fall animals came out. I was able to get the Harvest and Unicorn but still no luck with the Panda. I have tried every combo possible. Sorry, I wish I had a magic combo I could suggest but it's different for everyone. Sometimes it does help to use others suggestions though so I got my Unicornacopia with Rhino and Grassquatch. Good luck!
I know! I'm still trying for the Panda before he disappears and I got another two 9 hour fails in a row! I just keep hoping I will see the magic 16 hour timer. I might try my Owl Bear and Rhino next time. I know that adds another element into it but, Owl Bear is luck for me. It's worth a try at this point. Let me know if you get your Unicornacopia!
Ill send the invite when I go on in the morning. It's the middle of the night here for me and I just woke up and had to check and make sure my Mule was still in storage. I woke up feeling paranoid lol. I know one day if I ever get my Crystal Unicorn, my Owl Bear will probably be involved. Hopefully soon! Lol
I tried hydro yak and panda. I got the ocean owl (haven't got him!!). I'm happy. Will try again