Untap effects like Thousand-Year Elixir, Seedborn Muse, and Tyvar, Jubilant Brawler turn the Night Witch into an engine by letting you activate it multiple times a turn cycle, plus all that sacrificing pairs well with Midnight Reaper
Joshua, Phoenix's Dominant / Phoenix, Warden of Fire Joshua, Phoenix's Dominant starts by rummaging cards to help you smooth out draws and set up reanimation
2 Nahiri Nahiris story is one with a purely downward trajectory, a planeswalker so consumed by her desire for vengeance that it warps her beyond recognition
These effects more or less fall into two categories: Theyre either used as a form of graveyard hate to trip up your opponents, or to shuffle cards back into your library
But adds some nice little roleplay into the game and some background information