So long as you keep doses low on multiple orals simultaneously I don't think it should be any harder on your liver. 25mg of Dbol + 25mg Anavar shouldn't be any worse on your liver than 50mg of Dbol.
If you want to run the Dbol I'd suggest an anti-e, liquidex being the best choice probably to keep water bloat down. I'd suggest running low doses of Anavar the entire time, then use Dbol for the first half of the cycle and Winny for the 2nd.
Maybe something like:
Weeks 1-6: 20mg Anavar ED
Weeks 1-3: 30mg Dbol ED
Weeks 4-6: 50mg Winny ED
Doses are just a guess on my part, I have no clue what your previous experience with orals are or what your weight is. You would definately have to use clomid for a few weeks after this cycle.
Regardless what people love to say, you CAN get good results from an oral only cyle, it's just not as efficient to run them and because of liver toxicity the length of the cycle suffers. However instead of going for 8-10 weeks you can do some shorter burst cycles. 4 weeks on, 4 weeks off, etc...
You also didn't mention if you were bulking or not. If you're trying to gain weight I'd say to the hell with winny. I'd just do the Dbol the entire time along with the Anavar and save the winny for a diet cycle. So long as you use an anti-e to keep water weight down I'd say any weight you manage to put on with the Dbol/Anavar should be real muscle and keepable.