Saw the filter option after I made the post. The filter does not work quite as well as I would have liked though. I did have success by doing an item search with the word 'concordance'.
I am trying to pick a paragon level artifact that I can introduce into my game which is going to be split between Tomb of Horrors and Revenge of the Giants for most of the Paragon Tier. The party is currently level 12 and they just killed a Dragon in the Feywild (Draconomicon level 9 dragon lair with the dragon bumped to level 12) after completing Garden of Graves. I have never had an artifact show up in game before. I am currently leaning towards Whelm, which does fit reasonably well with the Giants portion of things. The Rod of 7 Parts might have been a good plan too, but I kind of waited a bit too long and I don't think i can work it in as well as I would like unless I let the players discover a few segments partially assembled.
Tomb of Horrors does introduce a custom artifact as well, but it is intended to disappear after defeating the adventure. The tricky thing for me is that the mid to long term portion of my game will be a mix of Giants, Primordials, some combination of planar travel, and undead. Most of the artifacts that seem appropriate to that mix are intended for Epic Tier.
END COMMUNICATION