schemer

from WordNet (r) 3.0 (2006)

schemer
    n 1: a planner who draws up a personal scheme of action [syn:
         {schemer}, {plotter}]

from The Collaborative International Dictionary of English v.0.48

Schemer \Schem"er\, n.
   One who forms schemes; a projector; esp., a plotter; an
   intriguer.
   [1913 Webster]

         Schemers and confederates in guilt.      --Paley.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

41 Moby Thesaurus words for "schemer":
      Benedict Arnold, Brutus, Judas, Judas Iscariot, Machiavellian,
      Quisling, archtraitor, betrayer, calculator, cockatrice,
      coconspirator, conniver, conspirator, conspirer, counterplotter,
      double agent, double-crosser, double-dealer, exploiter, finagler,
      informer, intrigant, intriguer, machinator, maneuverer,
      manipulator, operator, opportunist, plotter, quisling, rat,
      serpent, snake, strategist, tactician, timeserver, traitor,
      treasonist, trimmer, turncoat, wire-puller