So, based on the conversation you guys had about Hard vs Soft magic systems, I'm guessing none of you had ever encountered those terms before. I believe they were coined by Brandon Sanderson, who is the author of several fantasy novels, and a big fan of Hard magic systems, which all his books feature, usually quite prominently. Basically, Soft magic systems don't have set rules (or hardly any), while Hard magic systems do.
In a Soft magic system, magic does more or less whatever the author wants/needs it to in a given situation. The Lord of the Rings is a prime example of this. Does anyone actually know the rules of magic for Middle Earth? Nope, no one does. In Middle Earth, magic does what it needs to do for the narrative, nothing more and nothing less. Gandalf can do whatever is required of him for the good of the story, but when it's more narratively convenient for him to abstain from magic, he just doesn't do any magic. The costs, requirements, consequences, powers, and limitations of magic are completely (or at the very least, mostly) unknown.
A Hard magic system, on the other hand, does have set rules. A good example would be the Dresden Files. While it isn't a 100% Hard magic system, there are pretty well established rules regarding some requirements and limitations of magic. So, if Harry doesn't use magic to extricate himself from a tough situation because magic simply wouldn't help him in that situation, the reader understands WHY Harry didn't use magic within the confines of the fiction, rather than just as a result of narrative necessity.
Now, having covered all that, I feel like that question was a bit odd in the first place. The terms Hard and Soft magic systems tend to be used in relation to fiction (novels, TV shows, movies...), but I'm not entirely sure if they can truly apply to RPGs. RPGs, by their nature as Games, always feature rules; and those that feature magic, also have rules for how magic is supposed to work within the game and the game world, so I'm not entirely sure how one could have a truly Soft magic system in an RPG, unless anything to do with magic in the game was left entirely up to GM fiat.
All that being said, I'd be very curious if anyone has ever encountered an RPG that somehow features a Soft magic system.