The only way to actually shuffle you deck is to go to the editor and swap out atleast one card. MM is rigged. You play with one deck and you face the same deck again and again, then you change decks and fight a different(but the same) deck again and again. Play one hand, find all the mana, play another hand, find none of the mana. There are decks or combos that straight brake the game. You'll see people run the clock because you are about to win. I quit because a custom art card didn't show A/D.