One of our goals with this card was we wanted to encourage a white-black Zombie deck that was a bit different from the blue-black Zombie decks that came out of Shadows over Innistrad
From there, you get to sap away and eat their creatures, creating 2/2 flying tokens
Key pieces for a good Grima deck would be Strionic Resonator to double your thievery shenanigans, a good haste enabler through Swiftfoot Boots/Lightning Greaves as well as a way to punish your opponents such as Leyline of the Void or Dauthi Voidwalker
Or finally, as a win condition, stealing another player's creatures and swinging out
The issue with that is by turn six or seven when she is brought onto the board, there are cards that can challenge for the rest of the damage needed to remove her
Among those were the Plague Rats deck, the Lightning Bolt deck, and the Timetwister-Fireball deck