Massacre Girl is a finicky board wipe. Cast her onto a board full of 2/2s and she does nothing. But if there's even a single Savannah Lion mixed in with all those Grizzly Bears, then everything dies!
That means the trick to building with Massacre Girl is to make sure you have enough 1-toughness creatures to kickstart her killing spree. If you pull that off, you can sweep the board whenever you want. Once your opponents' best creatures are in the graveyard, you get to add insult to injury by reviving them on your side of the field with Command the Dreadhorde and Grave Betrayal.
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