What about creatures that pull themselves out of the graveyard?
Nether Shadow and Ashen Ghoul just pop out when 3 creatures are above them, Necrosavant comes out when paying lots of mana (and a creature sacrifice, I think) and Pyre Zombie and Shard Phoenix can be pulled into your hand from the graveyard, as well. The Shard Phoenix can also be used to remove all the pesky token creatures the Infernal Genesis will cause.
Death Spark is a fun card to consider, while Hammer of Bogarden's consideration should be in how many, not should I at all.
Cards that let you remove cards from graveyards...
Cannibalize might be good creature removal, as well as Disentigrate, due to their remove from game affects.
Buried Alive and Bazaar of Baghdad also fill your graveyard quite quickly.
If you add blue, you gain scads of library manipulation (Frantic Search and Fact or Fiction come to mind...) and fun creatures (and countermagic).
Hope some of this helps.