With a proper setup, Massacre Girl can accomplish that every other day
You should end up with 48 cards in total
Whether youre looking for a discard outlet and a way to clear the path for your Reanimator deck in a high-powered Cube, or a discard outlet for a madness deck in something like my Spooky Cube, Collective Brutality is a great tool for the job
However, it's not hard to prevent cards from leaving your opponents' graveyard, especially in Commander
This is a first view of what I hope will be one of the most awesome game rooms ever: The shot is from near the top of the steps (which are to the right), standing right in the middle of where the custom RPG pit will be (low, comfortable reclining chairs in a circle)
But it has a bonus twist: it only costs three mana if you target a tapped creature, ie a creature thats already attacked you