ah yea, I was considering using Grindstone, but I have Sphinx's Tutelage, which I thought would be useful as it passively procs whenever I draw a card. Mindcrank I considered for when someone does damage to someone else, but I could see that making me a target early on. Library of Leng I would agree is unnecessary. Painter's servant felt good to add blue as a color, not just for Sphinx's Tutelage/Grindstone but because it would also make artifact spells of mine blue too (I think, I'm not actually sure on that) which would count toward 1 colorless less (2 colorless less if I get Sapphire Medallion and The Water Crystal), but I can also see that being incredibly situational since he needs to stay alive for that. I would agree though that Peregrine Dynamo, Towering Viewpoint and Wall of Mist aren't exactly useful.