Most Evil MTG Character/Villain

I’m not asking about most powerful. But rather the most evil, nasty, wicked character. I just finished listening to the audiobook for Nemesis, and I can’t think of a more evil bastard than Crovax during the Nemesis block. Just viciously ruthless, needlessly cruel, he literally has his conscience burned out by a Phyrexian procedure, and it shows (I wish J Robert King had kept that personality more during Planeshift, but I digress).

Who do you guys have as the most evil MTG villain?