The Piggy Bank 
can be opened by purchasing it with real money.
can be opened by purchasing it with real money. Once you've saved up enough coins/magic power in the piggy bank, you can buy it all at once, or you can keep saving to buy more coins/magic power for the same price.
The maximum amount of coins/magic power that can go into your piggy bank is shown in the special offer window.
The fuller the Piggy Bank, the more profitable it is to buy it! 😉