Vandalblast is your best sweeper for artifacts, and the overload mode often seals the deal against other treasure or equipment decks
This deck is all about getting a discount
For Grixis, Nicol Bolas is great
(If this creature has no +1/+1 counters on it, put two +1/+1 counters on it.) Permanents you control have "Whenever one or more +1/+1 counters are put on this permanent, put an additional +1/+1 counter on it
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Her base power of 2/2 isnt very imposing, but combined with some auras and equipment, and her innate trample ability, it becomes a force to be reckoned with