The classic payoffs for the egg strategy are the cards that return artifacts from your graveyard to the battlefield or spells that put all cards that were put there this turn into play
Naturally, it would take a mad MTG genius to get every card exactly perfect, and Jeff says while he was pretty good on rules and numbers, he had particular trouble remembering the names of all the cards, and sometimes had to make something up that sounded right
When it comes to "win percentage" the Command Zone did 2 podcasts dedicated to figuring out which color was the strongest (their video here) and as you can see at 23:44 minutes in, they ran a poll where White is the 2nd weakest on the list
On top of that, if you end up milling over something like Champion of Wits for later, you start to create a lot of lasting card advantage as the game goes long
In addition to mana fixing, fetch lands have some extra utility with common cards in the format
, : This land becomes a copy of target nontoken artifact you control with mana value X