Sand Scout plays exceptionally well with Fetch Lands, creating a Sand Warrior each time a land hits your grave from anywhere
Lands and Golgari Depths are pretty cold to it, shutting down Thespians Stage / Dark Depths and requiring multiple hits from Punishing Fire or an Abrupt Decay to remove
Apart from pricing at retail, two of the most common reasons I've found for why sellers overvalue their cards is that they don't realize that some of their cards have been reprinted, or they are pricing from memory, often at a card's peak price
Not only does Sephirophs One-Wined Angel transformation offer a slew of powerful new abilities to keep the sacrifice train going, but he even provides a rare emblem that has massive combo potential for the format
One of those is Plaguebearer, which sees play as a sideboard option in mono-black attrition decks
How Often Do Magic Sets Come Out