I am using a 3/2/1/1 model with nearly all cards are from the main set. The non-basic common lands break this ratio by including 2 of each. I have substituted Shimmer Dragon, Rowan (pw deck) and Mace of Malice in the place of cards I don’t have or don’t like. 2 Evolving Wilds are here for some better fixing. There are no other substitutions. Even Knight of the Keep is there!