@erevans444
The problem with Gamble is that it's a bad card. In Painter, you'd go hellbent quite a bit, so Gamble is only usefu if you have an active Welder and an artifact in the field. Without SDT, Welder lost a lot more value, so it's not a card I more than two copies of in my 75. If I were to play a card that creates a card disadvantage, I'd rather splash white for E. Tutor. I think Magma Jet or Smuggler's Copter are better than Gamble since they have other utility. I would only play one copy of Smuggler's Copter at most though. I can see myself playing two Magma Jets. I might try something like this:

22 Lands
4 Ancient Tomb
4 City of Traitors
14 Mountain

16 Creatures
1 Goblin Welder
4 Imperial Recruiter
1 Magus of the Moon
4 Painter's Servant
1 Pia and Kiran Nalaar
1 Phyrexian Revoker
4 Simian Spirit Guide

22 Spells
4 Pyroblast
2 Red Elemental Blast
4 Blood Moon
4 Ensnaring Bridge
4 Grindstone
4 Chandra, Torch of Defiance

No reason to play fetch lands anymore. Just a much more streamlined build. Grindstones are pretty much useless in multiples now without SDT. May as well throw them with P&K. Up to 14 Mountains to be less affected by variance, which was partly mitigated by SDT.