Wouldn't it be better just to kill with something like a Deadly Insect at that point instead of Tempting Wurm? It's mainly useful for its cheap cost and if you play it later that doesn't help much.
I understand that you want to use Tempting Wurm, but I think it might be better served in a more aggressive, cheaper deck.
I just think it should be used along with cheap, if perhaps less effective overall, disruption to overwhelm quickly.