How to Use Magic Cards? | Help Center
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How to Use Magic Cards?

MPs (Magic Points) are required to use magic cards

MPs can be earned for merging identical characters in the field
When there is insufficient amount of MPs, Magic Cards will turn grey which means they can't be used at the moment
There is always a selection of 3 magic cards to use, and same card can be repeated 
The used card disappears from the selection and gets substituted by the next card 
There is a minor cooldown time for using magic cards of approx.1 second but depending on the card type
Some magic cards can inflict strong damage to monsters, others - increase the power of characters in the field, remove negative effects applied to characters or power up/weaken characters in the opponent's field