Trying to make a rakdos edh have some things on wish list however any ideas are more than welcome. And I would like a transcendent master

You're going to want Kaervek the Merciless; Butcher of Malakir; Balefire Dragon; Sheoldred, Whispering One; Malignus; Anger; Cryptborn Horror; and Mikaeus, the Unhallowed to name a few :)