First off, it would help if you had a list so we can see what we have to work with. Not all Forgemaster decks should run the same set of bombs. For example in my list (in the MUD thread) I don't run Staff as I had no Metalworkers to combo out with. My list was more standard and
works well even if you don't see Kuldotha Forgemaster, which is a bonus in my eyes.
For reference my toolbox was:
1 Karn
1 Duplicant
1 Platinum Angel
1 Sundering Titan
I don't count any of the other obvious inclusions (such as Trini) since it's already maindeck. I really liked the combo-oriented lists that try to win asap. My only problem was that it seems too delicate on the draw.
It seems almost imperative in testing to have 4 factories and I personally have been toying with putting in 2 darksteel citadels as well. In quite a few games, i was able to sac a mox, factory and spent tangle wire for an answer.
Really? I never found myself needing more artifacts. Technically all you need is TWO other artifacts. One Forgemaster activation should really swing the game in your favor in most situations. So far the best card to Tinker out for me has been Sundering Titan. One copy of Darksteel Forge in the sb seems nice too.
Another interesting point I'm finding out is that it is very tricky in Metalworker builds to find a good balance between going for the win and necessary lock pieces. Many games I have had Metalworker in play and gotten Staff out, but have been forced to constantly lay lock pieces to prevent the opponent from winning. It wasn't always easy to have 3 artifacts in hand.
I'm curious if anyone has a list with Precursor Golem and Forgemaster that they would like to share. If you don't have Lodestone out I really don't see a problem. The potential to do 18 damage in two swings seems like a really solid backup plan, or even a good Plan A. If an opponent wants to Claim what essentially is one permanent and give me 12 life, I'm ok with that trade. I'll be testing my own list shortly.