A nasty black & blue underworld dreams deck, with plenty of draw cards(howling, temple bell and blue draw cards).

add some black vice and crawler for extra damage and cover your ass with powerful counter spells, and you should be up for some fun pawnage :)

Take extra notice to some of the extra powerfull combos, Time reversal and Underworld dreams for example, or even stronger: Teferi's Puzzle Box and Underworld dreams!, a certain death sentence ;-)

general tricks:

A fun trick to make Temple bell extra powerfull, is to use it just before players discard face, forcing your opponent to discard any card he might draw above 7.
Totally one of my favorite cards in M11, even better than Howling mine!

and if you think Arcane Denial suck, think again...
in this deck, it is the ultimate counter spell.
It is easier to pay for than a normal counter spell, makes you draw a card(possibly damaging opponent with crawler) and forcing opponent to take up to 2 damage(for every "Underworld dreams" in play) if he wants to draw cards, how awesome is that?