I don't know, look at my problem:
-there is a shaco at the other team he's like a living nightmare, OP.
-When my team has the shaco, 0/6/1.

Rumble has no real counter, as he can always play safe with his escape and slow. Same with Yorick, he can be harassed back a bit, but he is still going to be able to farm quite well. There is no counterpick, only ones that can hold their own at their tower and manage not to die.

If you're actually having trouble against yorick try playing Nasus. When he summons a ghoul just AA-Q it and politely thank him for making you stronger

Well my main midlane choice is galio so i didn't struggle at all, she'd call upon her plants and all I'd have to do is W to heal up. All you need is a champ that can slow and zyra is screwed, she has no escapes if you avoid her snare. Only scary thing about her is that ult but it takes like 2 mins to come back into play so its no big deal

Yes, but Yorick just spams abilities and after his first back will not be going oom often. Like I said, there is no COUNTERPICK. If you are a hero that is going to be nomming fully on his infinite amount of minions - nunu, trundle, err nasus, he will push you so hard and go back, possibly roam etc. His bruiser like HP also allows him to easily avoid most ganks, as his ghouls will do considerable damage if he can get them up before a gank is physically touching him, he is more likely than not going to force your jungle off him before he even gets to safety of tower.

Malphite becuase of his skill set and with 5k hp and no dammage items u can burst a guy from full to 1/4 of his hp

Whenever i play against jax, i try to stay away from him

In my opinion Diana is currently OP, she was way too much burst damage while maintaining some tankyness. She can be a nightmare when she goes mid.

I don't think he's OP, but I can't stand going against Gragas.

I just started playing Gragas his range is ridiculous and i love it lol