I suppose the first question is: what does the forcemaster bring to the table here that you couldn't get from another mage (in particular, a wizard)?
The idea of a long-game oriented forcemaster is interesting, but it needs to be something that can only be done using the forcemaster.
Of the cards you have there, [mwcard=FWE01]Charm[/mwcard], [mwcard=FWE05]Forcefield[/mwcard], [mwcard=FWE07]Mind Control[/mwcard], and [mwcard=FWQ04]Galvitar, Force Blade[/mwcard] are really the only ones unique to the Forcemaster, and none of them really scream 'long game'. Upkeep costs cripple you in the long run, and Orb/Obelisk will be destroyed in a long game, after which your opponent can overpower you.
If you do intend to mind control all your enemy's creatures (definitely an intriguing idea, with the wardstones), you will likely need more than 1 mind control.
I think a wardstone-enhanced forcemaster is a great idea, since the forcemaster has some of the most powerful (if expensive) enchantments. If you want to go this route, you should add more copies of impressive enchantments like charm and mind control. Also, if you plan on a long game, drop the Invisible Stalker and add some thoughtspores instead. You can protect them with one-off enchantments like block/reverse attack/brace yourself. Sleep is another great spell to stock up on.