If you want to take it even further then I recommend adding protection like Pyroblast, more tutors like Doomsday, more fast mana like Mana Crypt, etc
(Usually, no!) White Auracite A is a more accurate depiction Moenbryda's white auracite crystal, but White Auracite B is a more straightforwardly appealing card and still gets the gist across, so that one made it into the Commander file
Youll want to copy creatures with powerful ETBs for guaranteed value
Wastes, on the other hand, needs to be specifically printed in a Standard set to be playable in the format
The amount of maindeckable artifact removal in Cube is slim, and most of it is attached to a four+ mana creature (Acidic Slime, Indrik Stomphowler, etc.), so the Shrine is rarely dealt with before its prime