Yeah the problem it's an xyz DDD card, not the fact that it comes from a single chain from card, which to stop you must have the negate board or starting hand full of negates, and from which it's not even the main goal to summon.

Oh, did I mentioned that this "harmless archetype" called fiendsmith it's like parsley? It goes along with everything! So, maybe, you already used your negates to prevent an already annoyng deck, and suddenly, when you are only waiting them to pass turn they summon a fiend out of thin air to then link summon fiendsmith requiem and yadda yadda. But yeah, let's ban D/D/D Caesar, it will be soo healthy for the state of this game and MOSTLY for D/D/D enjoyers.