Sounds good. Only issue I have is: Why "wood"? As far as I understand, the elements exist as things that are required to sustain life in the spirit world. Wood, however, is a part of a tree, which is classified as "life". Also, to be honest, "wood" is kinda a crappy name for an element. "I control the power of fire!" "Well I can bend the very earth to my will!" "I can do like... planty shit." I don't think you should add elements just for the sake of adding elements, basically.
Fire, Water, Ice, Lightning, Wind, and Earth
Assuming ice as an element is the absence of heat, I can see why all these might make sense. The only remaining element I can think might be necessary to sustain life is "Light", since without light, no plant would be able to grow.