what effect are you working with? keylight org color key? i suggest you to use keylight because you can adjust it like what do you want..
This isn't the most meticulously-planned shot I've ever seen, sad to say. For instance, one of those cards added to the shot actually has some green in it.
Think about trying to green screen Kermit The Frog.
To salvage it, I'd make a precision mask on a solid around the green card, motion track it into place for whatever kind of motion "swimming" describes, and use it as a track matte to fill up the green. I'd use Rotobrush to create masks for the cards being placed in the shot. I'd fake the shadows.
So there's no way to just do a garbage matte around the main green card and then basically say "Make the green in this matte transparent"...which would then just show the footage underneath it and keep the shadows and photos that are over it?
Really trying to figure out a way to not have to track every photo and then fake shadows, so pardon my ignorance on this.
You can try a garbage matte. You'll have to apply the motion track to it and perhaps animate some of the edges. It's difficult to say with the information available.
I can get a motion-tracked garbage matte really easily out of Mocha...the problem I've had before when I tried it was keying out the green without screwing up the overlaying edges of the photos that were in the garbage matte.
Maybe I just need to try some different keying tricks?