My friend had one Ninja Gollum Deck where Gollum gets big and kill people in by strenght also. In that scenario its pretty much reliable to have a 5 cost card with a potential devastating effect. I'm not a fan of that "luck dependent" combos, but you can do it.
The Smeagol card maybe can be used for a strategic double move in a choke deck (against any non cheap-swarm shadow). Doesn't matter if your opponent will take 3 shadow cards if he/she will not have pool to play it anyway (well, he/she could always get some cheap crushing event/condition from discard but not all shdows have that).
Anyway never tought in a deck that uses them... hmmm... maybe...