I thought I said this before, but apparently I didn't: I think that you want at least 1 Deluge in the 75, and if you're running just 1 then you probably want both a Golgari Charm and an Engineered Plague/Night of Souls' Betrayal in the board as well as that 1 Deluge. I don't think that Grixis is a particularly bad matchup: I'd put it at 55/45 in our favor, but with close games, unlike BUG Delver, which is also 55/45 but with much more polarized games. The extra sweeper is better against Elves and D&T, but I'd rather have the more versatile card preboard and then bring in the haymakers for g2 and g3.