This card needs to be limited. In the KC cup I faced 4 DM decks back to back & a lot of them had a least 2. The DM decks stopped me from getting to stage 2
All competitive dm decks run 3 cyrcles. No less.
The fun part is that the dm decks are not the problem in second stage. In fact they are easily handled. Mark my words. The top 4 list in kcup will have 0 dm decks. Just like all the other recent kcups till now why? Because are NOT THAT GOOD. They brick and they cant do almost anything vs target immune monsters or 2500+ attackers.
Well dm suffer from the same major drawback as the old desperado decks. Target immunity. Once your oppenent realise is facing a dm deck he will assap summon a sabredancer, cocytus, es lapauila etc. leaving you hoping to draw eye of timeus or dm expanded, if you run them. Also, lightsworn variants force you to use navigation in the main phase to stop lumina-brd, leaving dm helpless in battle phase.
I think you got a misconception about being bricky.
From your explanation, DM had a hard time to face certain archtype. And thats normal for deck to have a natural weakness. However, being bricky means you cant do anything other than watching your opponent as you cant even play your card ( ex: blue eyes brick dragon). A deck with huge change for being bricky wont get tiered in the first place.