While having multiple copies of Blood Sun isn't that bad because it cantrips, having a handful of Moons is painful, since we really only need one in most games
Then as we cast any spell not just instants or sorceries, we can earthbend 1, and 2 if a Lesson was cast instead
you can also spend one energy counter to give Multiform Wonder your choice of +2/-2 or -2/+2 until the end of turn
But Underrealm Lich falls more into the Angel of Suffering mold: a card that can rack up some massive self-mill numbers quickly with the right enablers, and which will also do a lot else for you in the meantime
Scar, Created by the Vine is a five-ink card that cannot be used in your inkwell
I like to break down cards for decks by "meat," "potatoes," and "vegetables" as an analog to what cards do for a deck