Can you clarify what you mean here? DTK doesn't seem terribly powerful to me. It just looks like Overcosted Fatties: the Set.
There are some very good cards in there. The pattern for a long time (since Scars, really), was that the set Erik Lauer was on would have a ton of very powerful cards, and the rest of the blocks surrounding it would have a much lower overall power level at mythic/rare, with a low number of high-profile all-star cards. This made those sets sort of lopsided, with a few specific chase cards in them that often blew up $-wise. Only Forsythe really came close to him in the set power level department, since he was willing to push things much further than others (like in NPH.)
In these three sets, however, we're seeing a much higher sustained power level at Mythic/Rare. That drop-off that normally occurs hasn't, and it's a good thing. I suspect it's in large part due to them knowing the sets rotate out faster, and thus they're willing to swing for the fences more in their design, since it will self-correct faster than normal.
Still 6 here. Don't really want to play it and a banning would devaluate it...
It's still very good even if Mastery gets banned.
