Thats a hard one!
I can think of a few possible candidates:
Ordinary Object Conjuration: lets start making whatever I want.
Loom-Snarling Deception: Be anyone.
Hypnotic Tongue Technique: I, Lelouch Vi Britannia command you…
Memory-Reweaving Discipline: You have always obeyed me, don't you remember?
Splintered Gale Shintai: My infinite army of clones conquers the world.