Starting to wonder if I might not like to have this... I think the vast majority of built from scratch is still available, and you can slowly supplement with other junk. 

Seems like wotc is just printing tons of stuff that fits into this deck - makes it hard not to pursue it

prob a bunch of the recent adds to karn fit here - foundry inspectory, that land that searches for artifacts, etc.

Try to really trade for a lot - just build with what you have if you can

kaladesh and aether revolt may have some good additions

try to get antiquities copies of jalum tome, feldon's cane, orcish mechanics, millstone, and atog

star city has a good article by bennie smith - feldon of the third path