Oxymetholone is anadrol.
NOT dianabol as juss 1 said.
adrol is a potent oral and very liver toxic, will blow you up massively but most will be water...once you come off you lose it.
as for stacking it with deca, another bad bit of advice, unless you want no bedroom action for a couple months (and knowing you thats unlikely!!)
tbh tho mate i wouldnt even consider using steroids, they are for when all else fails or you have hit your natural genetic limit, ie. a good couple stone heavier than you are now!
Else all that will happen is you will grow and shrink as you go on and off them, and then you will use increasingly larger doses to no real advantage until it gets to the point where you are dependent on them to hold on to less mass than you could have built naturally.
Unless you are at your genetic limit, or at least pretty close to it then they wont be what you are hoping from them.
(plus of course the side effects on top being another downside)