Is there currently a list on here of what artifacts you get for harvesting them at certain ranges?

A complete list has not been published, but the artifact market contains a good chunk of the ones available.

well i have noticed in other discussion boards the talk of terraformers and artifacts to increase your decks.. and stuff like that.. but you can't buy them.. and there not in any list i can find or how many artifacts are needed to get them chancely

most are around 2000-3000, they're too powerful or easily to be abused to be sold.

well how does that work trading them in? is it random or what? because i saved like 2800 points.. traded in.. and it only took 1000.. then i have to do another 1000 and then 500 or something.. so it didn't do that max first

when you trade in points for artifact shipments depending on how much you have when you receive the shipment the chances of getting higher costing artifacts go up but no artifacts are ever taken out of the receivable list.
AKA if you have 5000 points saved up you have a much better chance of getting one that costs 2000 then when you have 2000 points, but even if you have 5000 you can still get one that costs 400.

From what i can tell artifacts are %ed by how much they cost so (this is in no way true just giving things numbers) at 4500 points you have a like 20% chance of getting an artifact from the 2500-3500 list 30% for 1500-2500 40% for 500-1500 and a 10% chance for getting one from the 3500-4500 range.