Green screen back . . .

All I want is the cube(Becasue it fractures into pieces) and its shadow. But ive colour keyed out the green from the first mix node so i can get an alpha. But when i screen the shadow and cube togeather, the green comes back. I bet there is a better way to composite this. I’m basicly going to take this render and its Z-pass and add it in After Effects over live footage, for now ill key it out in AE. . . . .

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Forget the chroma key, just set the plane to receive shadows only no color, then render with RGBA to an image format that supports alpha channel.