Shyvana
Shyvana's passive is completely useless on any other map besides Summoner's Rift, and that's even assuming you get to kill a dragon or two.
Even if you kill some dragons, it really doesn't buff her all that much.
It seems like the extra damage/buff from dragons should be a secondary passive and not the primary.
As a side addition, she could benefit some sort of slow/stun. Maybe add a slow on her E similar to Ashe's volley.
However, I like the idea of giving her ult a stun if it crashes an enemy champion into a wall/terrain like Poppy's charge attack.