The Piggy Bank is a feature that will offer you a gold bar amount and magical answers, which will be accumulated as you earn crowns in the different game modes.
You will be able to access the progression of your Piggy Bank by selecting the icon that appears on the game’s main screen. Keep in mind that the more crowns you get, the greater the amount of items to withdraw.
To get the Piggy Bank's prize, you will have to pay a set cost in real money.
You will be able to buy it whenever you wish to, but keep in mind that the prize will increase as you get crowns; the more crowns you get, the higher the prize and, therefore, the more convenient it will be to obtain it.
For more information about how to get the Piggy Bank's resources, we invite you to visit the article: How can I get the Piggy Bank's resources?