Good champ to clim atm?

Well, since you're low Gold and you wanna improve and climb, I would recommend: Sejuani, Warwick and Zac. They're 3 great tanky champions with a lot of CC and utility for your team. Great gank potential and jungle control/clear. However, keep in mind that you should just focus in 2/3 champs and master them. Don't play with random stuff. You can also try Kha'zix. It's more complex, no CC, but a lot of burst damage. You can solo carry with him basically. Good luck :p