So I don't think the idea behind the Fetish mechanic is too complicated, but this has proven to be wordier than I anticipated. Fetishes are artifacts that do something on their own, but allow you to attach a dead creature to them so that they get some kind of boon.

I am wondering if making Fetish a type of artifact and incorporating that into the rules might possibly free up some space in the text box.

Even if you made fetish an artifact type, you'd need all the rules written as reminder text. The other problem with this is that creatures can't be attached to things. If you got rid of that rule, then suddenly animating equipment for example doesn't make them fall off, which leads to weird situations like a creature and the equipment that's buffing it both attacking. Maybe you want to make it like imprint: "Fetish - Whenever a creature dies, if there's no creatures exiled with ~, you may exile it. If you do, ~ gains (fetish bonus)."

I'm not sure Magic players are mature enough for this usage of the word Fetish.

Yeah, I do a double take every time.

Thanks for the suggestion Dude1818.

As for the word, well this is a custom set, plus I like that it has ecchi connotations to it; it helps to make the magic of the artifacts sound a little bit forbidden, albeit for the wrong reasons.

Reading it again, it might be better with "you may exile that creature." Otherwise it reads like you exile the fetish.

Coming back to this randomly, I'd like to point out that reminder text doesn't mention the name of the card it's on. That will help shorten it.