Indiscriminate discarding and beat down. The deck is a lot more aggressive than it may look with the clunky manabase and curve; Lightning Bolt, Blightning and The Rack are all burn spells, and Blazing Specter, Hellhole Rats, and Slave of Bolas all basically have haste, in addition to Sedraxis Specter when Unearthed.

The deck obviously packs a ton of discard (18 cards total that can make the opponent discard), but I don't think it overloads with pure discard effects - Rise // Fall can be used to bounce a blocker and recur a dead creature, Blightning is still a fine burn spell, and all of the creatures can attack just fine, whether or not the opponent has cards in hand.

As mentioned before, the deck is slow to start and the manabase is clunky (mostly because I'm not going to invest in expensive duals for just this deck), but a curve like T2 Fall / Sygg, T3 Specter / Blightning, T4 Specter / Rats is quite strong, and generates a lot of card advantage no matter how you cut it. Slave of Bolas may be excessive, I don't know yet - it just seemed like a really strong finisher for helping to push through my small creatures, punching through even more damage, and probably dealing with the only big threat my opponent has been able to get down among my flurry of discard effects.

The removal also seems okay - Bolt, Charm, and Slave of Bolas are all pretty powerful effects overall, and Charm especially provides great utility for a deck that's tight on disruption slots. Being able to bounce something with Charm and then immediately swing with a Specter / cast Fall to make the opponent discard it is pretty strong - Rise can occasionally do this, too.

Other cards I'm considering:

Recoil (over Grixis Charm)
Deny Reality (Oover Slave of Bolas)

Recoil is just awesome, and a little easier to cast than Charm, though it has a little less utility. It could be strong enough to make it worth including anyway, I dunno - I'll probably try both. Deny Reality seems really, really strong here, because I don't really have any spells that are never good, but it doesn't interact well with instant-discard effects if the opponent is on no cards because the cascaded spell gets cast first.