Asyou, the Forgotten

I am wondering if you think my Champion is designed poorly or well , below is his kit descriptions:

Passive: The Way of the Follower Gain 10% Magic Penetration at level 1, increasing by 10% every 3 levels to a maximum of 50% MPen at Upon reaching Level 15 Immediately after casting 6 abilities gain a shield that blocks some damage, the shields HP scales with Level and is triggered by being inflicted with damage from a champion or monster.

Q Ability: Vine of the Ancients Thrusts forward, damaging all enemies in a line.

On hit, grants a stack of Thunderstorm for a few seconds. At 2 stacks, Thunderstorm fires a vine that roots all enemies upon impact.

Thunderstorm is treated as a basic attack and scales with all the same things. Thrusts forward, dealing 20/45/70/95/120 (+100% Ability Power) magic damage. On hit, grants a stack of Thunderstorm for 6 seconds. At 2 stacks, Thunderstorm fires a vine that roots all impacted enemies. Thunderstorm is treated as a basic attack: It can critically strike, applies on-hit effects, is interruptible by crowd control and its cooldown and cast time are reduced by Attack Speed. If cast while dashing, Thunderstorm will strike as a circle.

W Ability: Tree of Protection Asyou summons a tree that blocks all enemy projectiles for 4 seconds. The size or width of the tree scales with level.

E Ability: Slick Branch Dashes through target enemy, dealing physical damage. Each cast increases your next dash's base ability damage, up to a max amount.

Cannot be re-cast on the same enemy for a few seconds.

If Vine of the Ancients is cast while dashing, it will strike as a circle. Dashes through target enemy, dealing 60/70/80/90/100 (+60% Attack Damage) (+20% bonus Magic Damage) magic damage. Each cast increases your next dash's base Damage by 25%, up to +50%.Cannot be re-cast on the same enemy for 10/9/8/7/6 seconds.If SThunderstorm is cast while dashing, it will strike as a circle.

R Ability: First Cough Blinks to a rooted enemy champion, dealing magical damage and holding all rooted enemies in the area in the to the ground. Grants a free passive shield but resets all stacks of Thunderstorm

For a moderate time afterwards, Asyou's basic auto attacks gain a significant Bonus of Magic Penetration. Blinks to an Rooted enemy champion, dealing magical damage and holding all rooted enemies in the area in the to the ground for an additional few seconds. Grants maximum a free passive shield but resets all stacks of Thunderstorm.For second(s), Asyou's basic attacks gain % Bonus Magic Penetration - this affects Armor from items, buffs, and runes.

Just want to know your thoughts on whether this champion is balanced or not and if you were Riot would you allow him into the game?