Is there any benefit(s) for building a faction deck? In some games a consistent faction (race etc) deck gets various benefits or the other way round - mix faction deck gets penalized. Well, after all it is not common that Elves and Hellhouds fight hand in hand

I have not noticed anything like that so far in Epic, but that may be because I am newbie.
By faction deck I mean deck where all cards, (units, spells, triggers) are from the same faction, like all from Hell Legion etc.
Anyone more experienced pls comment, thanks.