The ice element seems really unappealing compared to the others. It's active, but unlike lightning, it's targeted. Lightning's big benefit is that you can target the most valuable things, ice doesn't have that but still needs active play (or the obscenely expensive upgrade to make it like fire lite).
Most of the later element upgrades also don't seem all that valuable. Basic lightning + fire or fire + rock without any of the outer upgrades seems like the way to go.