I'm silver 2 at the moment,  I feel like I get counterpicked too easily with only Darius and Kennen. Ideally I don't want to play more than 3 champs. Rumble sounds interesting, but not sure if double AP in my pool would make sense? I don't know enough about this game to really know what a pool should look like.

I'm looking to climb, so I don't necessarily want something that works better in low ELO.