In the 8th ed lore of beasts I came across an awesome spell.
For a casting value of around 10+ it transforms your character into a manticore/hydra/dragon for a turn with cool profiles and rules (you choose the monster as they have different abilities). For a casting value of 20+ you can transform your wizard into an uber fire dragon/epic evil chimeara.
Cant wait-other lores are kickass as well