So, I'm pretty much a newbie here (and thus I don't have that much stuff yet) but I found this awesome mutation called primal felis and apparently I could be able to change my king to be felis but only with an heir.
As it is they are also apparently somewhat expensive but I could offer all my lions (except Upset and Nisqy, they were my first pair) and I have 199 SB, some event currency (10 MB + 21 Arena Tokens, if those are tradeable), plus few items.
I don't need that valuable of a felis, just so that I can change my king to one!