Elesh Norn, Grand Cenobite makes combat a non-starter for your opponent, and often kills off several creatures as soon as she enters the battlefield
As a result crimps can happen on the top, bottom, or even down the center of a card
You do need to pay life for the cards you may choose to draw, but Sylvan Library only needs itself to draw you some card advantage
Parallel Lives Another Token doubler, Parallel Lives effect is simply too powerful not to run in any green Token deck that can afford it
Its a custom magic cards maker for fan-made designs, playtest cards, reskins, and those what if this card actually existed? ideas
That said, it's super optional so you can just opt to not do it against decks which can burn you to the face and in Commander that life loss is pretty trivial, whereas getting an extra 2 cards on early turns is a much bigger deal