Wizard 5 / Icantatrix 10 / Wizard +2
Step 1: Draconic Polymorph into a Treant.
Step 2: Cast Girallon's Blessing. Savage Species version if you can. It's better
Step 3: Cast Evard's Tentacles
Step 4: Cast Fuse Arms
Step 5: Cast Fearsome Grapple
Step 6: Cast Bite of the Werebear
Step 7: PROFIT!
(assuming you have improved grapple, your grapple check will be about +45ish, before you count in BAB, and you can get Divine Power through Limited Wish if you must, for a mod of +62)