It doesn't count what elements it needs, but yes what elements it uses. For example, a Immo Rush doesn't need
![Light :light](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/light18x18.png)
in it, but they use Photon to Immo and as such it's a Duo.
On to the deck, it's a nice idea, but I feel like you're gonna have some troubles drawing 1 of 2 scorps / 1 of 2 CP + 1 Ghost out of 3 to pull stuff out. Maybe taking off the Enchant Artifact would be nice. The novas, while a nice addition, seem to be there to power the CP's. I don't know what to do for it, but I reckon a gravity mark and Unstoppables would be a bit better.
On a side note, if they won't be able to play much, I don't see the point of the Dune Scorp, although what they will play will still add a poison counter. The deck has a nice theme and is kinda original (well, when you get everything out at least). Nice going.