The noun deception can be countable or uncountable. In more general, commonly used, contexts, the plural form will also be deception. However, in more specific contexts, the plural form can also be deceptions e.g. in reference to various types of deceptions or a collection of deceptions.

What is the plural of Indigo?

noun. in·​di·​go | \ ˈin-di-ˌgō \ plural indigos or indigoes.

Is consciousness plural or singular?

consciousness /ˈkɑːnʃəsnəs/ noun. plural consciousnesses.