1st annual offline tournament "Best Of The Best"

I didn't ask about bugs by chance – since the rules prohibit using known bugs, and I'm relatively new to these kinds of tournaments and don't know them, I'd like to know what's allowed and what's not, so that my result isn't invalidated later, and I'm not branded as an unfair player.

We've probably discussed this same thing a hundred times already... :) Just use SoD 3.2 and check what's allowed and what's not. There's no double-casting, and you can't sell artifacts at inflated prices – and you won't have any questions. If you don't have SoD 3.2, download the executable (it's 2.7 MB) and use it! :)