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You can manage & track your card collection and decks once you create an account and login.
Nacelle cannot be used on your first turn if you go first. He increases the number of permitted plays (with a restriction), but the player needs that permission (In this case, being able to play an upgrade) in the first place to use it.
If you go second, you are able to play an upgrade using Nacelle during your turn, meaning you can play up to one card and also play an Upgrade onto a Decepticon with no printed abilities.