Magic?

Just a quick thought...

I've recently been playing the video game Powerslave, which is just an awesome 90s shooter. But it has one thing which has sort of stuck in my mind: When you pick up items, they have one use of each, though you can have several of them. However, using an item uses a certain amount of magic (yes, you have a limited amount) depending on the item. For instance, Full Health uses roughly half, Increased Weapon Power about a quarter, and Invincibility all of it.

So, I was thinking of introducing magic points into my rpgs, with items using a certain amount. Players could roll something like 3d6. If you wanted, this could lead to magic points instead of fire-and-forget, but I probably would not do that.

You could have, as well, items which have multiple, or even infinite, uses, but use a lot of magic. Which could be fun. Especially if you made them only useable by one PC.....

So, yeah, anyone got any thoughts on this?