Possible Motives

So I have a very rough idea where each motive is based on one of the seven deadly sins.

Pride - The deepest darkest secret of each student is hidden on the current floor. It is their choice to search for them or not. (This would more than likely be the first motive)

Wrath - There is a gun hidden somewhere in the facility. It only has one bullet. If you kill someone with it there will be no class trial. (Probably around the end of the story)

Gluttony - The food supply is cut off. The remaining students will have to make due with whatever they have left. The supplies will be restocked once a murder has taken place. (Not a huge fan of this one honestly.)

Greed - Money, I guess 🤷‍♂️. (Incredibly boring and already done in cannon. But, like, what else can be done with greed?)

Sloth - Each remaining student is shown the person, or persons, they're closest to on the outside. They are then informed that they'll soon be killed unless a murder takes place. (I do like this one quite a bit.)

Lust - ???

Envy - ???

It's not like I have to use all of them. Or use any of them at all. I just wanted to try giving my motives a fun coat of paint. I want to hear what you people think though. Is this a decent idea? I'm very open to input.