Magic Emeralds can be generated by using Snake Magic.


To generate Magic Emeralds, you need to activate the Emerald Hat (Snake Magic), which is displayed at the top of the screen during battle. 

The number on the progress bar next to the Emerald Hat indicates how many cards you need to play in a row to activate it. You need to play 6 cards to activate the Emerald Hat (see the image below).

To complete the challenge that asks you to "Generate X Magic Emeralds", play 6 cards in a row to activate your Emerald Hat, then play as many cards as possible before drawing a new card. 

Use a Wild Card strategically to play more cards!

Note: Each time you draw a new Card, the Apprentice Hat's progress bar resets to 0.