How many can be used at once?

[Lkawakita]

As Jaycee said some time ago, it is still confusing.

What I don't get is that type D/C thing. Can't they be used together?

I am a beginner here and got the Luck Magnifier (wich is type B/D hybrid) and decided to try my hand at the Change Eye Color one (wich I take it's a type C).

So, can I use them together?