I would rather bring in Needle against Wombat than leave Humility in. Humility is almost always dead. I didn't expect so much creture kill to be left in, so the creatures could have beaten down for the win.

I. Plus you did make several play mistakes including hard casting decree into a humility?
I did have a Disenchant plus another Decree in hand. It would have been enough to swing for 20 in two turns.