I bought the "Coin Magnet" from the shop intending to save up for unlocking story content, but after using it in the desert level, the coins it attracted blocked a crucial card. Just as I was about to turn off the item, I discovered a "Skip Penalty Card" hidden in the coin pile. Using it offset the 5 coins lost from drawing the bottom card, and an "Unexpected Gain" pop-up appeared on the screen. It turned out that this item had a double benefit.