Undead is a glaring hole as far as I'm concerned - I've got Zomdalf, and that's it.
I'm trying to breed Darzgul, but unfortunately I have a way to go as I was not able to breed Darknubis so far.
We have currently Noctum, Scryb, Dr. Victor and Sir Slumberly for sale. Could you rank them, please? It would be a hard purchase for me, as I didn't plan to spend more money on the game for a while and I have slightly north of 450 diamonds left - one vor VoltaiK (level-up offer at 54, I'm at 52 so far so no time to collect) and the rest was planned to get Timerion, Kiridar or Demise, whoever comes first. So, that's the competition for the 4 guys mentioned above :)