Heart of the cards

The idea that an inanimate object can someone provide you with exactly what you need at exactly the right time. The term comes from the popular Japanese anime/toy advert Yu-Gi-Oh, which centres around a card game played by the titular hero. Often when playing, Yu-Gi-Oh will call on the Heart of the Cards to provide him with the precise card(s) he needs to win the game, which it somehow usually does.