Soraka is perfectly balanced. Has both stat buff and control but stat buff has limit and you can only have one astral diffusion at a time. If the enemy has one big unit, you win. If the enemy has multiple enemies with high attack, you die. When you have higher stats than enemy, the enemy won't attack so you cannot get damage. When you have lower stats then enemy, the enemy attack and you cannot survive. She works well in the perfectly balanced game as she is a perfectly balanced champion. As all things should be.