For example, suppose we are at Draw 1 and I play Draw 5 as the first of my Draw 3 Play 2 cards. I’d need to immediately Draw more cards, right? So Where do they go? Should I put the extra cards in my original hand or in the side hand I’m using for the “Draw 3 Play 2” card?
A: New cards would be added to your set-aside hand in this case. Since you’d already drawn 1 new card at the start of your turn, you’d need to Draw 4 more and add them to your set-aside hand. It’s OK to look at them as you do — in fact, you need to, since you’d need to play and redraw any Creepers that came up in those 4 cards.
Similarly, if you played Jackpot! you’d add the new cards to your set-aside hand, and if you played Discard and Draw, it would be your set aside hand that you’d throw away and replace. If you played Rotate Hands, it would be your set-aside hand that you rotated.
Note that this ruling will also apply to Draw 2 and Use ‘Em (D2UE) and Fizzbin.