Target player discards two cards.
Morbid - If a creature died this turn, target player reveals his or her hand, you choose two cards from it. that player discards those cards instead
I really wish this was had a BBB casting cost instead of 2BB. I supposed its current casting cost makes it more playable in multi-colored decks, but when it comes to discard cards of the past, 3cc seems to be the upper limit of playable cards. That being said, it's still a 2-for-1 and if you have morbid enabled, it might actually be worth the mana.
I don't know what else to say that I haven't already said whenever a new morbid spell is spoiled: Without morbid enabled, it's overcosted. With morbid enabled, it's playable. So for a deck idea, just put together a deck where your creatures and/or your opponent's creatures die early and often. This deck would include the usually suspects of Gravecrawler, Strangleroot Geist, Geralf's Messenger, and spot removal.
Specifically, I think this deck needs a glut of 1cc, 2cc, and 3cc creatures in order to set up a perfect ramp for a 4 mana Gruesome Discovery. Ideally, this deck would hit a morbid Gruesome Discovery once you hit four mana as often and consistently as possible.