Hmm... Tornadus EX...
As for a regular card, it seems somewhat easy to deal with. It discards Energy sometimes on its own, uses DCEs meaning for Lost Remover bait, and Catcher/Crushing Hammers are still okay. Rotom isn't too great because of the not applying Weakness/Resistance deal. A teched Mewtwo EX might work as well.
As for donking purposes? Well, I really can't see much of a solution to that, aside from going in a totally random direction and building something like Tornadus EX/Durant deck... seems pretty awful, especially vs. Zekeels, but donks are less likely to happen, and you could nab a few prizes here and there before focusing on Devouring away... hmm...
Honestly though, Durant's in big trouble. Dark.dec pretty much kills it because of Dark Patch and Darkrai EX, Zekeels pretty much just needs a stream of Eviolited Zekrom, CMT has Tornadus EX and even the possibility of a suprise Heatmor, Troll/Tetrakion/etc. still is around 50%...
Sorry if this isn't the answer you wanted :/. I just don't see much of a future for Durant, but I might try out that deck I mentioned... CMT without the Celebi but with Durant
. Probably crap.
As for the other two, hi there. I'm bad at remembering people, but I do recall trading someone a FA Zekrom
.