Each one can also be cast converted by paying the More Than Meets the Eye cost on its front face
These special cards were included in WotCs Black Star Promo set
Lastly, it doesnt shuffle from your graveyard back into your library, allowing it to be abused by a reanimation effect or brought back with something like Den Protector
So, when I saw this land, I couldn't figure out what on earth it was, but then I looked it up and it all came back to me
Assassin's Trophy is a nice addition to the sideboard, but it isn't 100% necessary if you are trying to upgrade on the cheap, and the same is mostly true of Leyline of the Void (which is probably no longer optimal now that Rakdos / Jund Sacrifice is on the downswing)
How Is Typal Coupling Used