The Treant Polymorph spell is one of my favorite spells as it is, and I probably should make an "awesome thing" post just about Treant form. Although awesome all on its own . . . Using the mega "healing touch" Regenerate spell while in treant form for some reason is so much more fun than any other time I've cast Regenerate regularly! Why is that?
And actually, it's more of a combo move . . . foot stomp for the 50% bonus healing aura, Guiding Light charm for the +30% extra boost, and finishing up with Regenerate right as the polymorph is ending so that the heal carries over into the next two rounds. THAT . . . THAT . . . is awesome! And incredibly fun as well. :)