sacrifice the thrulls from Breeding Pit Buy with Skullclamp Buy or better yet with Contamination Buy to lock your opponents mana up as all black mana only, and sacrifice other thrulls with the abilitys they have then Grave Pact Buy will put every one elses creatures in to the grave yards so you can play really big Mortivore Buy or us Balthor the Defiled Buy to return your creatures after making your opponent sacrifice all their's. Or
you can sideboard in the infinite thrulls combo with Endrek Sahr, Master Breeder Buy Pentavus Buy
Ashnod's Altar Buy Recurring Nightmare Buy

This deck is slightly different than my real life set up but not by much. I may edit it to reflect my exact deck soon. I think k I basically run some of my sideboard cards you see posted.