I want to use the card Adaptive Automaton in my white artifacts deck. Most of the creatures in the deck are artifact creatures. Now, I am not sure if "artifact creature" is a correct creature type. Let's take Palladium Myr for example. It is of creature type "Myr" and also an "artifact creature". Are both attributes real creature types?
In case I cannot choose "artifact creature", those automatons will find a new home in my Elves deck, but I would prefer to have them in my white artifacts deck.