DarkMagic
Super Freak
From what I know (and I'm about as annoyed about this as I can be) the fact that HT's have never released a Ra's is actually due to a licencing issue with Liam Neeson. Obviously they have to get his permission in order to sculpt him and from what I read they couldn't manage to get permission to sculpt him.
I don't know why it would be that HT can't get the Neeson likeness rights but Mattel did.