This post has content warnings for: Custom Magic Cards.

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Maybe "spells that weren't cast and spells that were cast from outside the game" depending on whether or not you want it to work against things like God-Eternal Kefnet
The game rules can tell when a thing is a copy. It doesn't need to be more complicated to do exactly what it's meant to do.
Can it tell if things were a copy before changing zones, after they have changed zones?