[Champion Rework] Veigar, the Tiny Master of Evil

Inspiration: Again, Gameplay and Balance are to thank for this idea. The problem with Veigar currently is that he lacks an identity other than "massive AP" with Baleful strike, which, if pre-rework Sion's "massive HP" with Enrage was any indication, is not enough to save a poorly designed champion. While Veigar is certainly not as bad as old Sion, he still has issues which I'll explore in this fantasy fantasy rework.

Passive - Equilibrium: Veigar's Mana Regen is increased by 1.5% for each 1% of Mana missing. [Notes: Not a bad passive, and actually works better with my idea than I had thought]

Q - Baleful Strike (7/6.5/6/5.5/5 second cooldown) (75/75/75/75/75 mana cost): Active: Unleashes a bolt of dark energy in 900 range line, dealing 80/115/150/185/220 (+50% Ability Power) Magic Damage to the first enemy hit and all enemies within 150 range of the first enemy. If Baleful Strike kills a champion, Veigar may recast Baleful Strike for 5 seconds. Passive: Veigar permanently gains 1 AP whenever he kills a unit, increased to 5 AP against large units or champion kills or assists. [Notes: Changed the passive to match Sion's current W in terms of Bonuses. Also: kill-chain potential with combo]

W - Dark Matter (1/1/1/1/1 second cooldown) (20/25/30/35/40 mana cost): After a 1 second delay, dark matter falls from the sky to target location within 900 range, dealing 50/75/100/125/150 (+35% Ability Power) Magic Damage to enemies within 150 range. [Notes: More spammable version meant to be the primary source of damage output for new Combo. Also better to max to first now with reworked Q]

E - Black Hole (14/13/12/11/10 second cooldown) (80/90/100/110/120 mana cost: Veigar creates a small black hole at target location within 900 range, rooting all enemies within 150 range for 1/1.25/1.5/1.75/2 seconds. [Notes: More or less a utility spell to be used in place of the old Event Horizon]

R - Event Horizon (120/100/80 second cooldown) (200/225/250 mana cost): After channeling for 1 second, Veigar twists the edges of space around the target location within 900 range, forming a pentagon of walls with a 450 radius that shrinks to a 50 radius over 2 seconds before exploding in a burst of cosmic energy, dealing 200/300/400+(50% AP) to all enemies within 150 range. Enemies who come in contact with the perimeter are suppressed as long as they remain in contact with the perimeter and are dragged inward by the perimeter as it shrinks. [Notes: Probably OP as hell when used alongside the rest of his kit: definitely want to keep the shrinking cage aspect though]

Combo potential in end-game teamfights: 0s R start channel 1s R end channel, R start duration, W start delay 2s W end delay, W#2 start delay 3s W#2 end delay, R end duration, E start duration, W#3 start delay 4s W#3 end delay, W#4 start delay 5s W#4 end delay, E end duration, Q use.

Over 5 seconds, that's a potential of at least 320% AP coming at a potential of five enemy champions.

EDIT: Changed Scaling on all damage skills and reworked ult ranges and times. Should be much better in terms of damage output now ^_^