I played the following at our local tournament in NC last week:
# Mono R Stax
## Wiley
Creatures
4 Goblin Welder
3 Goblin Engineer
1 Lodestone Golem
4 Hollow One
1 Wurmcoil Engine
1 Myr Battlesphere
1 Sundering Titan
Artifacts
1 Black Lotus
1 Mana Crypt
1 Mox Jet
1 Mox Pearl
1 Mox Ruby
1 Mox Sapphire
1 Expedition Map
1 Mana Vault
1 Sol Ring
3 Null Rod
1 Thorn of Amethyst
1 Crucible of Worlds
1 Ensnaring Bridge
3 Tangle Wire
1 Trinisphere
2 Uba Mask
1 Mindslaver
Lands
4 Ancient Tomb
1 Barbarian Ring
3 Bazaar of Baghdad
1 Bloodstained Mire
4 Mishra's Workshop
4 Mountain
1 Strip Mine
1 Tolarian Academy
3 Wasteland
Sideboard
2 By Force
1 Tormod's Crypt
4 Grafdigger's Cage
3 Ankh of Mishra
1 Null Rod
2 Witchbane Orb
1 Karakas
1 The Tabernacle at Pendrell Vale
i went 3-2, getting 5th place. I lost to dredge (could have been won) and DPS which didn't seem winnable. I beat 2 white eldrazi decks and a non-welder shops list.
Random Thoughts:
Engineer as an entomb was great, and looping tangle wires was really strong. However, Sundering Titan can't really be played along side the engineers, you need the red mana to continue to get value out of him but the titan kills your mountain. plus titan just isn't as good as he used to be.
Expedition map was ok, but it was also terrible when all I had was shop or a mountain. It also doesn't play well with null rods. I would like to try out Golos if I were to play the deck again.
Every time I have slaver, I was short on mana to activate it.
There were a few time where, if I had a smokestack in the deck the game would have closed out a lot sooner, with less chances for my opponent to come back.
Uba Mask was a dud every time I drew it, and scouting the field it seemed like every deck it would be decent against ran multiple ways main and side to deal with it.
Hollow Ones were ok. They put in work, but I'm not 100% on them.
I really missed spheres, the land destruction plan just wasn't enough with things like force of vigor floating around.
Ankh of Mishra was a blank, I just didn't know what to put in there. Something like revokers or spyglass would have been better.
Witchbane orb did nothing vs DPS, I had it t1 in game 2 and they just chain of vapored it away and went off anyway.
There is an awful lot of value to be gained from welder tricks. Whether or not it is worth the 6-7 slots and the significantly worse mana base to support them is up in the air.
Something like the recent 5-0 "uba stax" decks seem just a bit better;
# Uba Stax
## Deunan
Creatures
1 Karn, the Great Creator
3 Golos, Tireless Pilgrim
1 Karn, Silver Golem
1 Lodestone Golem
4 Phyrexian Revoker
Artifacts
1 Black Lotus
2 Bottled Cloister
1 Chalice of the Void
3 Crucible of Worlds
2 Ensnaring Bridge
1 God-Pharaoh's Statue
1 Mana Crypt
1 Mox Emerald
1 Mox Jet
1 Mox Pearl
1 Mox Ruby
1 Mox Sapphire
1 Mystic Forge
2 Null Rod
1 Smokestack
1 Sol Ring
1 Sorcerous Spyglass
4 Sphere of Resistance
1 Thorn of Amethyst
1 Trinisphere
Lands
4 Ancient Tomb
1 Buried Ruin
2 Inventors' Fair
1 Karakas
2 Mishra's Factory
4 Mishra's Workshop
1 Strip Mine
1 The Tabernacle at Pendrell Vale
1 Tolarian Academy
1 Urborg, Tomb of Yawgmoth
4 Wasteland
Sideboard
1 Crucible of Worlds
1 Ensnaring Bridge
1 Null Rod
1 Sorcerous Spyglass
2 Dismember
2 Grafdigger's Cage
4 Leyline of the Void
3 Walking Ballista