Yeah, Ironworks/Gardens is what I think is the "root Combo". By this I mean the thing that is so good, absolutely nothing else beats it. And since I made that postulation, at least in my own games, it's been true: in any game with both ironworks and Gardens on the board, I've only lost in games where my opponent also went for a variation of this strategy. Now, this isn't to say you shouldn't go for other cards WITH this combo - i.e. if workshop is on the board, you should prolly go workshop/ironworks/gardens - but I have yet to think of a board where a gardens/ironworks-centred deck doesn't win at least 50% of the time. It's incredibly resilient at any rate, and can absorb most problems other decks can throw at it, especially curse-givers, which a lot of other strategies can't boast of, and it is fast enough to beat a lot of other strats.