Note: The draw two play no longer exists it is truly a dead play.

STACKING

When you enter the redzone, you also earn the ability to stack. Stacking is getting rid of multiple like cards by name simultaneously on the discard pile. The bottom card of your stack must follow the discard rules.

Get rid of these Nickels all at once. Bottom card matches the likeness of the card on the discard pile.

Get rid of these shotguns all at once. Bottom card matches the color of the card on the discard pile.
The stack to the right is incorrect because the bottom card is green.

stacking Action cards

If you stack action cards, only the action on the top card is playable.  

On this stacked draw play only the top card action is used
so your opponent would only draw one card not two.