Ok, going with the Prismatic Golem.
Which grants incorporeal, but her equipment sticks with her, so fun times? Her attacks ignore armor, shield, and natural armor bonuses for fun. And she is hard to hit.
Anything that touches her gets to feel the rainbow, as defined by a d8 roll.
Also, everyone gets haste. Except the enemies.
Finally, she is casting combust on the leftmost winterwight,
(1d20+41)[53] Touch
(1d20+25)[44] Spell Penetration
(10d8)[39](+5 for Knowledge Devotion) Fire damage(No save)
Reflex save DC 15 or catch on fire.
Ok, hopefully, done! It only took a couple of hours. Seriously. Shapechange. Sucks. So many options.