Play traumatize, then use keening stone. Your opponent will have half their deck in their graveyard, and keening stone mills cards equal to the number of cards in their graveyard
{Traumatize} {Keening Stone}
^Ha, nice.
Might need some mana accelerant, but real nice 1-2 punch combo
I'd use this in dimir because dimir would make use of the traumatize with or without the keening stone