ORIGINAL: gzg38b
Couldn't you just put up another stand a few yards away? When the deer looks at the empty stand he'll relax and assume he's safe.
But you'll be waiting for him in the new stand 10 yards away or so. That would be easier than using a dummy IMO.
OR you could borrow my tree saddle and set up on the back side of that same tree, just behind your treestand. You'll be hiding behind the tree out of sight but the stand will be empty. When the deer relaxes and comes in front of the "empty stand" just come to full draw, bend your left knee slightly to slowly creep around the tree and let him have it!