Gatecrash Pre-release: Dimir

Gatecrash's Pre-release is only two months away! Personally, I like the Simic and Dimir guilds the best. In fact, the game mechanic for Dimir has already been revealed. The guild's mechanic is obviously mill. But how is it different from the mechanic from the original Ravnica? The Gatecrash Dimir mechanic is as follows: Whenever a creature deals combat damage to a player, that player discards that many cards from their deck. We actually have a card that already does this. That card is Crosstown Courier from Return to Ravnica. I have also heard rumors that Chronic Flooding is going to be reprinted. All I can say is that there better be a few cards making creatures unblockable. If not, it would actually be much easier if a couple blue-black creatures could not be blocked.