How are cards that say Discard on them? Bad for cube the way walls are? They print
Mind Rot in 4 out of every 3 sets so there must be a Discard.mwdeck out there?
I may be misconstrudeling this question, but if you're asking about a discard theme in cube,
safra's made a great thread about it before. It's my opinion that the only bad discard for cube is probably
Mind Twist and, potentially,
Thoughtseize. There are a number of Thoughtseize perspectives.
A) Thoughtseize is awesome and powerful enough to see play in any deck; thus, it's worth including.
B) Thoughtseize is powerful enough that a T1 Thoughtseize can potentially win you the game for free, due to your opponent keeping a shaky 7/6.
In my experience, Thoughtseize performs the B scenario so often that I had to cut it. However, I still push a discard deck very gently, and have tried a few cards over the past few months. Feel free to peek at the thread (and perhaps my cube, but it's going under the knife right now) for some ideas on what black cards perform and what don't, but personally, I've really enjoyed
Blackmail and
Cabal Therapy. I'd love to grab up a
Kozilek's Inquisition, but I'm cheap and don't want to spend that kind of money right now. Still, I expect to try to push my discard suite a notch, as it's really awesome when a deck has a few discard spells in it; just 1 is "nice", but when you hit 3, you really feel like it's a new axis of disruption, rather than just a 1-off "I hope this hits something lol" effect.