2 headed version of Multiheaded Template in SS
Buy a PAO from the local magic mart, perhaps level 3.
Be a Medium or smaller Outsider.
1 rhd + (2 rhd +2LA) = ecl
5 ... EDIT it's ecl 4. The 1rhd gets x-ed out.
Do the SS ritual later, because it's cheaper than
a counter dispel magic / counter-counter pao item.
Then go Ardent 2 for Magic Mantle, broad interpretation.
Needs +2 MLs probably via CL boosters. Something here:
http://community.wizards.com/go/thread/view/75882/19872350/Raising_Caster_Level?pg=1Gets the level 4 powers on time.
The LA+2 with the RHDs gets fully bought off by levels 19 or 20.
Basically: 3 RHD / Ardent 2 / Slayer 9 / Anarchic Initiate 4 / ??
But a TWF specialist (which I am not) should chew this up.