Not sure if this is worthless, and certainly kind of fun/not sure if it's competitive, but thought I would try to use some rares and mythics that aren't used too much (the lands are certainly the most costly cards).
The premise here is to steal your opponents creatures/permanents and sac them for your own benefit to prevent the return trip.
Another goal is for the stealing cards to be as useful as possible even when facing an empty board.
There are additional interactions here, however.
mark of mutiny, traitorous blood and zealous conscripts all can steal treacherous pit dweller back for you, and even though they don't save your desecration demon from being tapped for the attack, they can allow him to be a defender/force your opponent to sacrifice another creature to attack through.
this is obviously a rough sketch, thoughts would be appreciated.
4rakdos guild gate