Metalworker seems underplayed right now..
the problem with metalworker right now is that everyone wants to beat mentor and people play swords and/or lightning bolts. basing your deck on metalworker is not a good idea when everyone out there is prepared to kill a creature of the same size.
@Kai That is a concern, but most mentor decks are maindecking only one swords to plowshares, some also adding one ancient grudge.
Adding Cavern of souls and goblin welder back into the metagame is a great way to dodge removal of artifacts. It also makes 4 cards in the mentor main deck completely dead, in mental misstep.
The whole strategy behind metalworker is to either have it removed, or activate it and be in such an advantageous game state after resolving all the artifacts (possibly even winning on turn 2 with staff of domination.) In the first case, they waste resources removing a 1/2 creature, in the second case, you just win the game.
the strategy for workshops has to move away from running 9 sphere effects and praying that your opponent can't get out from under them, the shop player has to proactively be trying to win the game rather than attempting to prohibit the enemy from executing their strategy.
I've been playing around a bit with Metalworker again.
Dropping wurmcoils feels like a good place to be with reality smashers hitting the battlefield frequently.
Most of my testing has been with something in between a metalworker/martello build. I'm not saying this is optimal, just a starting point.
4x Kuldotha Forgemaster
1x Lodestone Golem
1x Chalice of the Void
2x Phyrexian Revoker
1x Phyrexian Metamorph
4x Sphere of Resistance
2x Lightning Greaves
1x Staff of Domination
1x Staff of Nin
1x Coercive Portal
1x Spine of Ish Sah
1x Steel Hellkite
3x Wurmcoil Engine
1x Blightsteel Colossus
1x Sol Ring
1x Mana Crypt
1x Mox Ruby
1x Mox Pearl
1x Mox Jet
1x Mox Emerald
1x Mox Sapphire
1x Black Lotus
4x Cavern of Souls
4x Ancient Tomb
4x Mishra's Workshop
1x Strip Mine
1x Tolarian Academy
I'm not saying this is perfect. In particular, the phyrexian revoker suite in the Eldrazi decks feels exceedingly painful, and to be completely honest in might be worthwhile to trim some slots and add in two crucibles and a couple of ghost quarters. I've also moved away from Thorn mainboard, and I'm not entirely certain that is correct.
My board is a mess, holding my pet Ugin's Nexus, some thorns, tormod's crypts, an extra duplicant and a couple of metamorphs, and a few cages of the grafdiiger variety.
Honestly, the mainboard duplicant is likely also a holdover from previous iterations/oath heavy metagames. Griselbrand is still scary, though, so I'm reluctant to get rid of it.
This could get very interesting as it looks like our Eldrazi overlords have now come to the Vintage Plane. If they really card some space in the format, I think we may have to look at Bridge and Mask version of shops because I think Shops just got out Aggrod. We'll see, this recent MTGO event I think is big news.
If Eldrazi sees the same level of play on paper as it does on MODO (perhaps the NYSE this weekend will tell that tale..) there could be room for a more dedicated Stax list. Players will have to gear their boards more towards creature hate (dismember, roast, swords to plowshares, Murderous Cut) and go lighter on pure artifact hate.