
Good initiation and burst damage early on.
Your combo is usually: Nether Swap immediately into Magic Missile.

Helps with pushing down towers/fighting, while providing a strong aura to your teammates aswell.

We start with it during the laning stage for harassing the enemies/pushing down the lane and getting an early advantage by being able to go on them.
Cancel Clarities/Healing Salves with it.

You can save allies or put enemies into bad positions.
Works on Spell Immune units.
Follow with Magic Missile to kill off enemies.
Use Force Staff to reposition yourself after saving an ally or swaping an enemy out of position.
Core Items
Upon death, creates a strong-illusion of you that can cast all your spells and deals 100% damage and takes 100% damage. Illusion has 30% movement speed bonus. If the illusion is alive when you respawn, you will take its place. XP earned by your illusion is given to your hero.
Magic missle now bounces on a 2nd target.
Increases the range of all your skills and items.
Increases the cast range of your items / abilities and also reduces their cooldown by 25%.
Increases your teamfighting utility / good against buildings.
Situational Items
Good against psyhical damage heroes / increases your tankiness. Perfect against heroes like medusa / wraith king / pa etc.
Good against psyhical damage heroes, increases your damage aswell.
Defensive item which protects your from being locked down and magical damage.
Increases your attack range and provides good stats.
Situational utility item which improves your teamfighting abilities.
Increases your tankiness and provides good stats.