Riot, could you please ban Senna from ARAM for while, until you find out proper balance?
Extremely long range + AOE healing + able to trigger on-hit effects (for example, Duskblade of Draktharr) from extremely long distance away + AOE rooting + AOE damage + camouflage + AOE shielding + bonus movement speed + basic attack and abilities ignore Yasuo's W
Please Riot, ban her before you do the nerf