Cassiopeia Rework Idea

[Q] - Cassiopeia blasts a 175D area with venom after a short delay, inflicting 60/105/150/195/240 (+40% AP) magic damage on enemies over 3s. If an enemy Champion is hit, Cassiopeia gains 12/14/16/18/20% Movement for 3s. <Mana> 40/45/50/55/60 <CD> 4

[W] - Cassiopeia creates a cloud of toxins that expands from 150D to 325D over 7s. Enemies in this area take 15/25/35/45/55 (+15% AP) magic damage every second for at least 2s and are Slowed by 30% for at least 2s. <Mana> 60/70/80/90/100 <CD> 14

[E] - Cassiopeia throws a projection of fangs at the target enemy unit to inflict 40/80/120/160/200 (+40% AP) magic damage and heal for 2% of her own max HP. If the unit is poisoned, this spell cooldown is reduced to 0.5s. <Mana> 45 <CD> 5

[R] - Cassiopeia unleashes hidden power in a wide cone after a short delay, inflicting 150/250/350 (+60% AP) magic damage on all enemies and Stunning them for 2s. Units hit from behind are Slowed by 50% for 2s instead. <Mana> 150 <CD> 130/110/90

Ability "Aspect Of The Serpent" - Cassiopeia gains 1 stack every 3.5s plus 1 stack per poison tick dealt against Champions, with a hard cap of 500 stacks. Bonuses from stacks gained are as follows: > 75 = Spells have 10% Magic Penetration > 100 = +5% Ability Power > 175 = +20% Spell Vamp > 200 = +10% Ability Power > 275 = Spells have a 10% Damage Output debuff vs Champions > 300 = +15% Ability Power > 400 = +20% Ability Power > 500 = +25% Ability Power