I love it.
It IS entropy, though I can see how it COULD be dark, but its certainly not needed.
It's a very interesting card both for CC and for just outright winning in the right situation.
When I first saw it, my thought was on splitting enemy creatures to nothingness while sitting behind a dissipation shield, but...well, splitting your own strong creatures could be very fun. Particularly with boosts, this could be an amazingly deep card.
Its CC, its a way to win, its a way to get extra uses of abilities, its...love at first sight *swoon*