3 class levels on a normal Rakshasa for Barbarian 1 (note: you don't use the rage, obviously, you just care about Pounce via Lion Totem (CC))/Totemist 2 (Girallon Claws bound to Totem Chakra)
That's Pounce with 5 to 7 attacks on a full attack (depending on whether you let the Girallon Claw attacks stack or overlap with the Rakshasa's natural claws), or 6-8 with Haste.
Slap on (Extended) Wraithstrike, Power Attack and Leap Attack and have some simple blender-style fun.
Use the Elite Array for ability Scores to get a somewhat higher Strength as well.
With the Rakshasa's full BAB your looking at a Pounce/Charge with 6 to 8 attacks, all with +16 damage from PA & Leap Attack.
Artificer aside, that should put a nice dent in the other party members, and it's simple and light on bookkeeping (at least compared to a Rakshasa more focused on casting) as well.