Bottle Gnomes A card so immediately conceptually obvious that it could probably be used to teach Magic entirely on its own
As long as you keep your graveyard filled with powerful creatures, 5 mana to reanimate and attack with one over and over again is a pretty good deal
If an opponent has eight or more cards in their graveyard, you may choose both
A few Double Exposure texture foil Legendaries like Kaito , Tyvar , and Niko were valued from $60 to $70, except Valgavoth
Plus, even the bad mythics (perhaps outside of Apex of Power) aren't really that bad, with the Elder Dragons being worth a couple of bucks (and being relevant for Commander) and Bone Dragon being a sleeper for post-rotation Standard, assuming that Golgari has some sweet graveyard synergies in Guilds of Ravnica
Much of Nihiloors power comes from the huge swing in board control you get just by resolving them and triggering their ETB