Urgot isn't played much because of his looks. He was really strong but they nerfed him quite a bit. He's still going to stomp most bot lanes if they don't know how to handle him.
Soraka is a nice support for Urgot, because she can feed him more mana for endless harass. Janna for double shields.
In all honesty though, if you want to try Karma, go ahead. It's not like you'll be jumping into ranked games right away anyway.