6 SoP, 6 maxwell's demon and 4 nymphs is excessive. Expensive creatures aren't very good in SoP decks, you should add some cheaper creatures like micro abomination or chrysaora to take full advantage of the shard. In addition, adding a few ice bolts will let you kill more things with the demons. Having six Maxwell's isn't going to help any more than two or three, because they can only kill specific creatures, even if you have six of them they can't touch a cockatrice. Ice bolt would help keep control of the enemy much more effectively, perhaps try something like this:
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4vc 4vc 4vc 4vc 4vc 4vc 4vc 4vc 4vd 4vd 4vd 4vl 4vl 500 500 50u 50u 50u 50u 50u 5i8 5i8 5i8 5i8 5j2 5j2 5j2 6tu 6tu 6tu 8pp
It's still horribly weak, but at least this one can pretend to work.
Hopefully a few upgrades don't damage your theme too much.