I am preparing for a hichschool chess team competition.  What is a good d4 opening I can use that is obscure but straightforward enough to play at my level?

Opening prep for a high school tourney might be wasted as soon as your opponent plays their first or second move.  Whatever floats your boat, though--adding a new opening to your repertoire can't hurt.  As for which one, it might help to know what openings you are already playing.

I play queen's gambit, stonewall defence, and mason attack.  is that Jaws from James Bond movies, btw?

It is Jaws, yes.  He looks happy, doesn't he?

The Queen's Gambit is huge.  Add in the Stonewall and the Mason Attack, and you already have a sizable set of variations to study.  I'd work on becoming more familiar with the openings you are already playing.

At your level, studying openings is 100% waste of time.  First learn the basic principles of development and try to follow them.  Then practice tactics - you lose most games by overlooking a simple tactic, that's what you should be working on.  And the basic checkmates and simplest endings.