Throne of Eldraine used Syr for all its Knights, so that seemed like a good place to start
As for the two big decks, I guess you could ban Emrakul, the Promised End from GB Delirium, but I'm not even sure how much that would matter
Ashnods Altar and Nim Deathmantle make this a loop that can generate infinite mana of any kind, while letting you eventually play all the nonland cards in your library
Sure, there are turns where you'll be forced to only attack for one damage - often the first turn - but after that, it's unlikely she'll be attacking for one again
My very first 100CS decks featured Tezzeret the Seeker, because I realized that his tutoring ability would be really fun in an artifact toolbox deck
Ever since I saw the showcase version of Garruks Gorehorn, I couldnt get over the way it came out