This is the current incarnation - I try to change it up a little after every time I play it. This one goes for an early Sword/Foundry combo to fuel Forgemaster - then get Unwinding Clock out, and spend a cycle dropping the rest of the threats in the deck. Indestructible Sphinx of the Steel Wind is pretty devastating. There are probably too many tutor effects in this version, though. It just kind of ended up that way as I made changes It pretty much guarantees that I go off by turn 5 or so, though.
Dromar's Cavern seems abysmal. There's no way that it's better than another pair of Sanctums.
Trinket Mage and Fabricate are the 2 most overrated "artifact" spells of all time IMO. They're low power, low impact and thus rarely leave a meaningful mark on the game. Your deck has 1 Mana Vault, 1 Map and some lands that it can fetch with the Mage. That just seems miserable. I don't see why you need a 3 mana "ramp/mana fixer" when you could simply play a Thirst for Knowledge/Rhystic Study and usually get the same thing only better.
The Sphinxes all seem odd. The Sharding one seems largely uncastable and completely win-more. You're not going to Forgemaster for it, and if you are then you've already won a long time ago. Double Steel Winds also seems a bit frivolous. 1 is fine as a Forgemaster target I guess but I don't see a reason to commit more than than for it. You're not really casting these in a 22 land deck so you really just want the 1.
Alright; I realized after that comment that I hadn't really paid attention to some of the stuff I had cut from last time - so, a complete overhaul was due. Now there are couple different big beaters to swing in, depending on the board state. The Sphinx is still my favorite though, which is why there are two copies. The only targeted removal in my meta is usually PtE and StP, so I like a little redundancy there.
That's a good idea; I just pulled a couple Mystics and a Batterskull from another deck, so I have some free. (since I play Death and Taxes as my Legacy deck, I try to avoid my gut impulse of adding that package to every deck - but sometimes I miss when it would have actual synergy^^)