It doesn't matter what your mark is, nor what quanta the deck produces, Deck Classification is based solely on what from elements the cards that make your deck are from.
If I have 24 Quantum Towers and 6 Elite Skeletons, it's a Mono - Death deck, and a quite ineffective one. If I have 18 Quantum Towers, 6 Elite Skeletons and 6 Cremations, it's a Duo - Fire/Death deck. It's pretty simple
![Smiley :)](https://elementscommunity.org/forum/Smileys/solosmileys/smiley.gif)
This would be a
![Gravity :gravity](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/gravity18x18.png)
/
![Air :air](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/air18x18.png)
deck.