I know, I know, however since they have 1 hp now, it's not that uncommon for the opponent to be able to destroy them; SoW does also grants a nice extra 4 attack, but overall you're prolly right that a fifth SoR seems better, or even just removing the SoW and go down to 31 cards.
Overall the main trouble I have is when I dont get a nymph early, 3 or even 4 clearly would be better; in fact, maybe I should add an Hourglass instead of the SoW.