I agree with the others in the sense that a Babylonian tarot deck would be more "in tune" with the energies from the Simon edition Necronomicon, but that really wasn't the question you asked.
Personally, I would use the deck normally within a circle with the watcher around you. Maybe use it to question things you summon forth or, even, the guardians of the gates. Maybe you can ask a certain God (Inanna, Marduk, ect., ect.) for help and to answer your calls/questions then use the tarot deck within the circle. Hell, maybe you could communicate with your Watcher by using the deck. The possibilities are endless.
I would suggest that, if you are going to use tarot with the Simonomicon, thatyou use your Waite deck until you have the money/the availability to go out and get a Babylonian deck. -Kranos
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