OP skills you can think of

Time to improve your creativity!

You can change any properties of a skill or a hero's skill set as few as possible and immediately causing it to become an OP skill/skill set.
e.g. Naga Siren's Song of the Siren is now global ranged ( only 1 property is changed ).

Rules:

• Damage value/ratio cannot be changed
• Cooldown timer and mana cost cannot be changed, as WTF mode is not allowed
• Buff duration of skill with DoT cannot be changed, this includes Doom's Doom
• AoE cannot be changed
• Total number of illusions/summoned units cannot be changed

So.. Let's begin!

I'll start with:
Pudge's Meat Hook now has unlimited skill range.
All skill from Zeus is now pure damage.

Coup de Grace now has a 100% crit chance

Pudge's Meat Hook travel speed increased to 10000

Mirana's Sacred Arrow now phases through creeps.

Witch Doctor's ultimate doesn't need to be channeled anymore.

(Getting refresher would mean double Death Ward O_o)

I got a few. Hopefully they fit your criteria.

When you use Ice Blast, you have full vision over the enemy team's heroes until the blast is released.

Chain Frost now additively subtracts 20% magic resistance per bounce.

In Elder Dragon Form, Dragon Knight's Dragon Blood will grant a bonus 5% health regeneration.

In Sand Storm, Sand King cannot be detected by True Sight, except by Towers.

False Promise's delayed damage is not lethal.

Sticky Napalm now amplifies damage from all source.

Heartstopper Aura is now a pure damage instead of degeneration.


PREPARE FOR NERFFFSS

Holy **** those are awesome. Just OP!

Ogre Magi: 4x Multi Cast chance now 100%.

Clockwerk: Hookshot targeting method changed: now point OR unit.

Bane- enfeeble is now a 1000 AoE skill.

Medusa-mana serpent steals mana 10/15/20/25%.

Lina-Fire slave now does pure damage.

Juggernaut- blade strike crits deal pure damage.

Bristleback- Quill Spray mana cost reduced to 5.