Cartas de conjuros en Héroes de las Tierras Fronterizas / Spell cards in Heroes of the Borderlands

Helloo, I just bought the last starter set (heroes of the borderlands) in spanish and I'm missing one card out of the 53 that the box should contain. I wanted to figure out which card I was missing, so I started placing each card in its respective slot. After checking every level of the magic classes, every item, every species, and every background, I still can't find the card that wasn't in the set. Furthermore, I've noticed that there are 5 spell cards (besides the missing one) that I just can't find a use for. Does anyone know where they're used? 

The cards are: Shocking Grip, Magic Missile, Grease, Ray of Frost, and Ray of Sickening. (I've counted cards in pairs as two, as individuals).

Thanks you!

Hey!

Here is an unboxing of the spanish version released last week. You can check the cards included in spanish and maybe it'll help finding out which one is missing in your pack. Good luck!

https://youtu.be/pKQMHhaAvko