The fact that it's an artifact is great too, since even though Affinity lists might not want this, it has some great synergy with Deadly Dispute-style cards in general
Narcomoeba and Prized Amalgam were already there
In the event that you are pressed for life, even in a Commander game, Sylvan Library still lets you draw two cards and put two back, at the very least improving the quality of cards in your hand for a turn or two
We have a new Time Walk variant with Part the Waterveil, and it offers us a lot of useful options
(All three cards are brand new, so TPCi has hidden them from the product image so Japan gets to reveal them first.) Shrouded Fable Kingambit Illustration Collection (available Aug
+1: Target player mills two cards