[quote=@ArtifactCreator]
[@Rex]
Are we specifically summoning these Servants using artifacts/mediums or we just reaching into the abyss and seeing what we are getting? Cause if its randomized summoning, then I don't have to make as detailed of a post :P 

(I presume its randomized since us Masters with Gilgamesh running this are the first to accomplish the ritual with no actual preparation?)
[/quote]

I would say its randomized summoning.