Unlimited Wood
Once you have the forest Miracle, use it in an empty space near to your village store. Then take all the trees but 1 and place them into the village store. When you have 1 final tree left, click the little helicopter leaf and then shake your hand left to right quickly. This will give you back all the prayer points you spent to cast the miracle in the 1st place. Repeat this process as many times as you want.