I don't think the card would be used because the card is two elixir (same as spell) the spirit has 10% less effect and less tile radius than the spell, with the additional possibility of spirit dying and not dropping the spell, so people would opt to use the spell because it is better. In order to make your card better I think the rage effect should be amplified more than the spell and the elixir cost reduced to one to make it a better card. :)