RG02_XR 3GG Creature Beast 4/4 Trample CARDNAME gets +4/+4 as long as there are no cards in your graveyard
To "flip" a permanent means to change it from the top half to the bottom half, not to change it from one side to the other
Outside of the set, treasure has taken up residence in many a deck, along with other artifacts you might want to sacrifice
Not only is this a great encouragement not to have people hide behind a lot of cards (perhaps fueled by a Reliquary Tower) but it also works well with the basic deck concept
My mother who found them has not let me forget it, Shaw laughed
If you can keep Atraxa in play, it'll obliterate opposing forces, dole out enormous chunks of commander damage, and keep you well-defended in the meantime