Some simple rules you can add to each creator card, for eg on a music card, I could do, "Only add if clip is >20s". Or something similar, nothing too complex as that would deter new users.

PS: It doesn't even have to be information about the match like, "if headshots" (which would be nice though because the current headshots cards play on non-headshot kills if there was a headshot in that match, which is a bug).