For Grixis, Nicol Bolas is great
Thats fantastic value, especially with some anthems or Impact Tremors effects in play
Vandalblast is your best sweeper for artifacts, and the overload mode often seals the deal against other treasure or equipment decks
and should you cast Hare Apparent #23,489, youd have a board state thats two hundred and seventy five million, eight hundred and seventy eight thousand, three hundred (and five) strong
If you have means of putting +1/+1 counters on Dihada, or other boardwide buffs (like the one provided by Day of Destiny) she also would no longer be put into the graveyard for having 0 loyalty counters
This deck is all about getting a discount