Famine is 100% the most overpowered troop now.
The lowest mana cost of any mythic
Jinx - which makes it harder for you to surge meaning even your poor little low mana cost valkyrie may end up not even getting its mana before famine does..let us not forget 2 famines making that even worse..
Full team mana wipe - combined with the above if hes not blocked the fact he can take 3 colors gets mana faster than a 2 color troop via cascades and is only 33% more mana than most standard troops who have 15.
Let us not forget the ability to 1 shot something... War, Ketras, Jotnar who are built to be more based on being a 1 shotting troop don't even manage to do as well as famine does.
Even down to his colors Green, Yellow, Brown. 3 colors that generally are left alone or increased in the current meta. Most of the time people will take reds for valks,DS,deep borer, alchemist. I am aware valk and alchemist use 2 of famines colors but anybody who uses them knows generally you focus red with the red/yellow banner. Then you have the purple like even rushing the new nyx to stop it, again you have DS main mana generator, kraken, green seer, helcat, banshee. Again they all offer one of famines colors but they are far from the focus. Finaly Blue - spider,wraith,skullbeard,justice, webspinner, krytenax.
Short of running a manticore, silent one or and cockatrice team which are a hard counter to themselves manticore being on the weaker side and silent one being...tricky and cockatrice giving away potential huge brown mana surges.
Overall as a complete package it is just way beyond what the current troops in the game that are used in most peoples team have at their disposal to counter with any reliability.
Personally I don't see how its mana is not 24 hell throw a 25 on there if anything should have the highest mana cost its something that can potentially remove over 50++ mana from the enemy team and then turn it into damage! Beyond that it may also need the Jinx to be removed. Courage again as in per bone dragon era adds to the problem in a big way with famine.
Alternatively I have always thought that his skill is technically mana burn and as such if its made to be a mana burn it has some trait counters specifically for mana burn and of course imprevious troops which would make it a lot more inline I feel.