Any time a Magic card gives you the option of substituting a different resource, be it life, creatures, or cards in graveyards, for mana, that card is worth a second look
As such most control decks simply supplement their deck with the odd pure card draw spell to smooth curves or act as top quality filler and are able to function pretty well without any of the pure form at all
Note that you can reduce the cost of Conflux, or other Five Color cards as well
Ertha Jo, Frontier Mentor provides another ability doubler, as well as a pair of bodies to pick up dropped equipment
The cards will differ in their artwork, which portrays the Nazgl as they are described in Tolkiens books - with red eyes, a detail absent from the later films