I was playig yorick even when everyone was complaining that he was underpowered. Admittedly he was slightly but I still managed to hold my own filling more of a support role then really being the meat of any combat. It was fun but the experience is certainly more enjoyable now. I am however keeping my build on the tanky side of things. I like to stay in combat longer and wear opponents down with pokes from omen of famine and omen of pestilence. Heal and clarity are both there to keep you in lane early game and for clutch situations in late game play. The masteries may seem a bit weird but I gave it some thought. They seem to do the job. Try this build and if it doesnt work out for your then learn from that experience and find your own way to play. We each do things a little differently so what works for me might not work for you. Also Feel free to switch up the summoner spells ignite and flash are always fun.