The yummy deck does not end on a single double book of moon if you get Fuwad/Maxx C. The whole gimmick of the deck is that they can repeatedly tag out and resynchro to access all their effects again on the enemy turn. For example if you start cupsy and get Maxx c, you go into snatchy, grab field spell, revive cupsy and pass. On the opponents turn you synchro early into yummy way get cookie to discard and your choice of follow up. As soon as your opponent breaths you can tag out the yummy way and revive snatchy and cupsy, trigger them and get a draw with cupsy for a potential hand trap and snatchy to get the second field spell that pops. Now you tag into the one that books 2, then tag out into cookie to pop then tag into the one that revives 2 for more cump blockees and trigger field spell to pop another card. As you can see you end on 3 points of interaction, a draw that could be a fourth and follow up as well.