We have just released a bug fix release to Apple for Decked Builder 2.8.1 for the iPhone. This resolves the recurring question bug when you create a new deck.
We apologize for the inconvenience, and suggest that you create a new deck by re-saving an old one as a workaround in the meantime. Alternatively, you could use our mtgo-stats integration (from the News tab) to use an existing, tournament worthy deck as a base.
– Tan Thor Jen