Angry Birds 2/Cards

Cards appear in Angry Birds Under Pigstruction. When you play a level, there will be three cards appear at the bottom left of the screen. The cards are the birds or spells that you will choose for the next shot. Choose one by tapping them, just like choosing the birds in Angry Birds Stella's pigs slightings levels. The card will be leveled up if you collect enough feathers. However it is used to attack the pigs. If the player runs out of them, the level is failed and has to be restarted.