Dark Matter is overpowered. Easily one of the hardest FG. The best way to beat him is to use a deck that is designed to counter him, some of which can be found here: http://elementscommunity.org/forum/index.php/topic,9507.0.html
Basically, mono aether is your best bet (although RoL/Hope also works to some extent), because Dark Matter is usually only good against mono decks early game. Upgraded pillars will give you precious quanta early on which you can use to stall with phase shield (he has no perm control so you will get full protection) and wait until quanta control with BH loses its debilitating effect. Even then, quite a bit of it is luck though, as early grav nymphs will ruin even mono decks.
Early Lobotomizer is also important, because you can remove momentums, and stop grav nymphs from spamming BH.
Yes its a hard deck, and will completely wang most decks that are not mono element (though once of twice my rainbow has managed to beat it on an extremely bad draw). I don't have a problem with that, I enjoy the difficulty of most FG decks.
My point is this:
1.) Dark Matter is likely to defeat the majority of rainbow decks so rapidly that the Nymphs don't have much impact on play. They only serve to
guarantee that a rainbow deck will NEVER be able to move against darkmatter when they come out very early.
2.) They're largely useless against mono-decks, because a large number of towers generate too much quantum every turn for them to handle.
3.) Letting a FG play unwinable and incredibly bothersome cards creates no additional incentive to play against that FG, because the cards with the most potential to abuse you are also forbidden from Spins.
If we accept these points, basically the only thing these cards do is force ragequits. With 12 black holes, Darkmatter is going to cast enough of them to COMPLETELY hammer an unlucky rainbow deck on basically ever engagement anyway. That's fine. That's what he's supposed to do. He surpresses your power source and takes off to an early lead.
It seems pointlessly cruel to combine all that potential with the limitless BH potential of a nymph, so that even if you manage to make it through 3 or 4 blackholes and begin to mount a defense, he can permanently lock you down.
Why leave in these rage inducing cards that
also taunt the player by being no-spin?