ASU for those that doesn't have.

Increases duration from 25 to 40 seconds.
Increases HP Regen from 25/50/100 to 50/100/150.
Now gives 20/30/40 STR and 20/35/50 AS.

Increases damage multiplier from 0.6/0.85/1.1 to 1/1.5/2.
Increases AoE from 300 to 450.
Reduces cooldown from 70 to 30 seconds.

Reduces cooldown from 55 to 15 seconds.

Reduces cooldown from 70/60/50 to 30 seconds.
Increases cast range from 100 to 350.
Now deals 20/50/80% of distance moved as damage. HP Removal

Increases cast range from 1000 to 1300.
Increases damage from 20/40/60% to 25/50/75% of distance moved as damage.
Reduces cooldown from 70/60/50 to 50/40/30 seconds.
When the target is affected by Strygwyr's Thirst the damage is increased to 50/75/100% of the distance moved as damage.

Increases bonus gold to Bounty Hunter from 150/200/250 to 200/275/350.
Increases bonus gold to allies from 50/100/150 to 75/150/225.
Increases bonus MS from 20% to 40%.
Now reduces target's armor by 3/5/7.
Now gives bonus 50% experience when the target is killed.

Increases max stacks from 5/6/7 to 8/9/10 stacks.
Increases stack duration from 14 to 25 seconds.

Increases bonus damage from 60/80/100 to 60/110/160.
Increases lifesteal from 40/60/80% to 50/75/100%.
Increases duration from 14 to 20 seconds.

Increases damage from 1/2/3 to 2/3/4 times Centaur's STR.
Increases slow duration from 1.25 to 1.5 seconds.
Increases duration to 5 seconds.
Now stuns for 0.5/1/1.5 seconds before applying slow.

Increases illusion count from 1/2/3 to 2/3/4.
Increases duration from 24 to 30 seconds.
Reduces the damage taken of illusions from 200% to 150%.
Reduces cooldown from 140 to 100 seconds.

Increases bonus HP from 50/65/80% to 50/75/100% of the target's HP.
Increases bonus damage from 5/6.5/8% to 5/10/15% of the target's HP.
Increases duration from 35 to 45 seconds.

Increases damage from 53-58 to 60.
Reduces cooldown from 100 to 80 seconds.
Increases spirit count to 8/16/24.

Superior Magic Immunity (Immunity to all spells, pure/magic damage)
Gives flying movement and unobstructed vision. 1800/1800
Gives 50/100/150 MS. Lvl 1/2/3
Increases splash AoE from 100/200/250 to 100/300/500, 300/650/1000 and 500/1000/1500. Lvl 1/2/3
Increases the attack debuff duration from 5/5/3 to 5/5/5. Lvl 1/2/3
Decreases BAT from 1.7 to 1.5/1.0/0.5.
Now deals 50/100/150 DPS. Lvl 1/2/3 now applies to all in AoE. Stacks 10/30/50 times, refreshes stack time when stacked again.
Slow increased from 30/20% to 50/50% and 100/100%. Lvl 2/3
Purges enemies. 2000 Damage to summons or illusions. Lvl 3
Gives 10/30/50x the effect of the Dragon's Blood.
Reduces 5 armor per attack to the enemies in the splash aoe. Stacks 10/30/50 times, refreshes stack time when stacked again.
Increases Dragon's Tail cast range from 400 to 700/1000/1300.
Increases Breathe of Fire damage from 90/160/230/300 to 150/350/550/750
Now always a red dragon just grows in size. Size: Black Drake/Dragon/bigger than Black Dragon.
Now it is toggleable, drains mana over time.
25/15/5 Mana per second.
Stuns for 2/3/4 seconds on cast of the spell in a 300/600/900 AoE.

Now gives bonus agility equal to 50/100/150% of your agility excluding the bonus agility from Marksmanship. Gives as bonus agility from marksmanship (removes if you get in 400 aoe of drow)

Increases damage dealt from 35% to 40/50/60% of Max HP.
Increases AoE from 300 to 600.
Now stuns for 1/2/3 seconds then applies slow.

Now gives 0/1/2 extra tether skills that doesn't share cooldown with tether.
Now gives the ability to cancel the relocate return.

Increases duration from 40 to 100 seconds.
Refreshes cooldown of other skills.
Reduces cooldown of other skills by 1/2/3 seconds.

Increases buff duration from 8 to 12 seconds.
Increases stun duration from 1.4 to 1.4/1.7/2 seconds.
Reduces cooldown from 60/50/40 to 50/40/30 seconds.

Increases bonus damage from 10/14/18 to 14/18/22.
Reduces cooldown from 50 to 40/35/30 seconds.
It is now retro-active, previous duel victories will now give bonus damage of the current level of duel.

Reduces cooldown from 100 to 30 seconds.
Increases attackspeed and damage by 5/10/15% of the Max HP of consumed creep for 5 seconds.
Can now cast spells while using infest, sharing your skills with the infested unit.

Increases bonus armor from 4/6/8 to 7/11/15 armor.
Increases bonus damage of Battle Cry from 20/40/60 to 30/60/90 damage.
Increases bonus armor of Battle Cry from 2/4/6 to 3/6/9 armor.
Increases the duration of Battle Cry from 8 to 16 seconds.
Increases HP Bonus from 200/400/600 to 300/550/800 HP.

Increases the critical strike damage fom 170% to 325%.
Increases BAT buff from 1.5 to 1.4/1.3/1.2.
Now gives 2/4/6 armor.
Critical Strike now slows AS/MS by 40% for 3 seconds.

Increases stun duration from 2.25/3/3.75 to 2.5/3.25/4 seconds.
Increases damage from 50/125/200 to 100/200/300 damage.
Gives extra 100/175/250 bonus damage when affected by Skewer.
Gives extra 0.5/1/1.5 sec stun when affected by Skewer.
Reduces cooldown from 120/110/100 to 80/70/60 seconds.

Increases bonus physical damage from 30/40/50% to 50/75/100%.
Decreases bonus magic resistance to enemies from 100% to 90/70/50%.
Increases turn rate slow from 50% to 100%.
Removes Mana Cost.

Increases duration from 15 to 25 seconds.
Reduces cooldown from 140/120/100 to 100/80/60 seconds.

You can now create an illusion of morphling.
Increases illusion damage from 50% to 100%.

Increases AoE from 1250 to 2500.
Increases duration from 7 to 9 seconds.
Reduces cooldown from 180/120/60 to 100/70/40 seconds.

Increases damage from 250/400/550 to 300/550/800 damage.
Reduces cooldown from 70/60/50 to 50/35/20 seconds.
Now applies a ministun.
Now drains 40% of total mana of the target.

Increases Coup De Grace chance to proc from 15 to 25%. 40% on Phantom Strike attacks.
Increases Coup De Grace chance to proc for Stifling Dagger from 15 to 100%.

Increases max illusion count from 2/4/6/8 to 3/6/9/12.
Increases bonus chance for Juxtapose from 2/4/6% to 6/9/12%.

Reduces fade time from 3/2/1 to 2/1.25/0.5 seconds.
Increases backstab damage from 0.5/0.75/1/1.25 to 1.5/2/2.5/3 times agility when breaking invisibility.
Doesn't break invisibility on smoke screen.

Reduces cooldown from 50 to 36/24/12 seconds.

Increases max soul count from 12/20/28/36 to 12/24/36/48.
Increases slow and damage reduction from 50% to 80%.

Reduces cooldown from 260/160/60 to 180/105/30 seconds.
Reduces mana cost from 140 to 140/70/0.

Increases armor reduction from 10/15/20 to 10/20/30 armor.

Increases duration from 4 to 5.5 seconds.
Reduces cooldown from 65 to 25 seconds.

Increases damage from 355/505/655 to 400/650/900 damage.
Reduces mana cost from 175/275/375 to 150.

Increases duration from 5/6/7 to 8/10/12 seconds.
Never removes your illusion until the duration ends.

Reduces initial mana cost from 15 + 7% to 10 + 2% of total MP.
Reduces mana cost per 100 units from 10 + 1% to 0.5% of total MP

Now increases raw bonus damage by 50/75/100%.
Reduces cooldown from 80 to 60 seconds.

No Trap limit.
Now slows by 50% at start.
Now also disarms.

Reduces cooldown from 150 to 90 seconds.
Now hits enemies with anchor smash.
Anchor Smash now stacks.

Increased cast range to global.
Increased chakram MS from 900 to 2400.
Removes cooldown.

Removes mana cost.

Increases AoE from 625 to 1250.
Also silences abilities and items of enemies.

Increases AS Bonus from 60/120/180 to 120/180/240.
Reduces cooldown from 30 to 15 seconds.

Now gives a 100% Cleave for 1 attack. 400 AoE, also applies AoE slow

Increases bonus damage from 5/6/7% to 8/9/10%.
Increases duration from 14 to 20 seconds.
Now gets damage from Max HP.

Reduces cooldown from 60/50/40 to 45/35/25 seconds.
Removes mana cost.
Now goes back 5 seconds from 4 seconds.

H3llcat - For some ideas
MathsDebator - For some ideas