While it wouldnt happen, i would hope his basic insta kills all jedi besides general kenobi.
Otherwise i had a thought for his forced ally taunt. Once grievious falls beneath 100% health, gain stealth for 2 turns and force the b1 battle droid to taunt (since he sounds like the nightsister zombie from the road ahead kinda), and while stealthed grievious has plus 25% life steal.
This way he can stay behond a tank constantly and heal himself back up, and you need to be strategic on killing his heath in either 1 shot, or applying buff immunity, ot just clearing buffs
