Aghanim, the Arcane Master by giogsgs12

Aghanim is an extremely powerful soft-disabler who is meant to gank a lot starting from the early game in able to snowball hard into the late game. Armed with a powerful set of abilities, he can nullify both attackers and spellcasters alike with his Fade Blast and Arcane Erosion respectively. Additionally, his passive, Arcane Erosion is a retroactive ability that can let him focus on a carry hero early on and have it pay off later with powerful magical damage from his other abilities. Energy Attunement is both a great supporting ability, but can also be effective when cast on himself as an offensive tool for dealing heavy magical damage and stunning multiple enemies at the same time. Finally, his ultimate De-synchronize is a useful ability at later parts of the game, but subpar early on, that allows Aghanim to theoretically send an enemy hero back to level 3. It is also meant as an instant single-target ability to stun an enemy from a decent distance with the help of Energy Attunement without the fear of being interrupted while casting.

Fade Blast

• If used with Energy Attunement, it can be a very powerful spell that can stun multiple enemies at once.
• It grows more and more powerful with every kill thanks to Arcane Erosion.
• Taking away an enemy's damage will force them to cast spells, which can be less effective if you used De-Synchronize on an enemy first.

PROS:

• Decent early game damage
• Great zoning

CONS:

• Damage doesn't scale very well
• Affected area is visible and easily avoidable

Energy Attunement

• Fade Blast is an AoE spell, allowing for multiple shorter stuns, while De-synchronize is unit target for a longer stun.
• Even if used on allies, it still works with Arcane Erosion making the bonus magical damage hurt extra hard.
• When used on yourself, you can use it with items, making long ranged item actives like Urn of Shadows, Rod of Atos, and Dagon become stuns.

PROS:

• Allows Aghanim to fit well in any lineup
• Hard disable for most abilities

CONS:

• Requires good communication
• Wasted if not used with an offensive ability

Arcane Erosion

• The magic reduction grows stronger whenever enemies spend mana to remove a De-synchronize debuff stack.
• Also if you kill enough, this ability makes not only your Fade Blast and Energy Attunement[/color more effective, but also your item actives like Dagon, Eblade, Shiva's Guard, etc.
  

PROS:

• Allows for lategame potential
• Gives entire team extra survivability in long fights

CONS:

• Aura does nothing at the start of a fight
• Draws a lot of unwanted attention

De-synchronize

• Since it requires mana to shed off a stack, it allows Arcane Erosion's attack speed and magic reduction to become more effective if the enemy decides to do so.
• It can also lessen the effectiveness of abilities by enemies inside Fade Blast's area of effect who are forced to use them while their attacks do nothing.
• Energy Attunement's stun is also much longer for single target abilities, which De-synchronize is.

PROS:

• Highly effective against heroes whose abilities scale well
• Forces abilities to be used prematurely

CONS:

• Mediocre cast range
• Requires setup
• Easily removed by some heroes