If you destroy all of your opponents mana sources and keep a nice array of mana generators on your own field, you put yourself miles ahead
I know, I know, it is not technically sacrificing a creature, just killing it
The alternate commander for the deck, Aragorn, King of Gondor, is a powerful card, capable of opening up the battlefield to stop your opponents from doing anything to stop your attacks
The basic prison package includes Chalice of the Void, Trinisphere, and Blood Moon, locking players out of spells and mana and forcing them to pay more for any spells they get to cast
Card Kingdom is sold out of those, however, so youll have to buy your copy elsewhere