As MTG Rocks noted, the Nazgul uncommon is actually tough to find in collector's booster packs, and most of all, for flavor reasons, this card has nine different versions of its illustration to represent the actual Nazgul characters
Putting one or more land cards onto the battlefield with The Gitrog's triggered ability doesn't count as playing a land
Additionally, the deck makes good use of efficient threats like Ragavan, Nimble Pilferer and cheap interaction like Galvanic Discharge
Siren Stormtamer There are some high-mana pirates out there
It would be too strong for Modern, and the only reason it doesnt see more play in Legacy is both Brainstorm and Ponder being legal alongside it (though it does show up some)
However, they could often be slow and clunky in multiplayer gameplay, at least by todays standards