Naga Siren/Counters

Bad against...

 * Both of Lion's and  destroys Naga Siren's illusions in an instant. Making it hard to teamfight or push against a team with Lion.


 * Outworld Devourer's deal bonus damage to illusions which is a very good way dealing with Naga Siren's illusions.


 * Huskar's ultimate ability does almost one-hit kill a Naga Siren illusion because of the percentage based damage. This makes it very hard to push against a Huskar.


 * Zeus' abilities deal high amount of burst magical damage which ignores Naga Siren's high armor. Zeus' is also a good way to destroy pushed in waves and clumped up Naga Siren illusions.


 * Timbersaw's innate tankyness is very hard to deal with as Naga Siren. Timbersaw's high Pure Damage and spammable nukes can also destroy Naga Siren's illusions very fast.

Others

 * Sand King
 * Alchemist
 * Entry

Items

 * Scythe of Vyse
 * Pipe of Insight
 * Orchid of Malevolence

Good against...

 * Ensnare disables QoP's Blink, making her escape impossible.


 * As Pusher, Naga Siren can destroy treants fast.
 * Ensnare preventing Teleportation.


 * Siren Song is long enough to make Duel fail if she not dueled.


 * Esnare disables Lanaya's invisibility and Blink Dagger (Core Item on TA), and your illusions easily will break her Refraction.


 * Song of the Siren will render Guardian Angel useless.

Others

 * Bounty Hunter
 * Techies
 * Lycan

Works well with...

 * Well, both come from the sea. Seriously, Tidehunter's Ultimate works very well with Song of the Siren as TF initiation.


 * Another sea teammate. Same reason that Tidehunter.


 * Song of the Siren+ Kinetic Field+Static Storm, and the enemies won't be able to counterattack in a team fight, especially if Disruptor has Aghanim Scepter
 * Naga Siren's Ensnare ability helps razor to fully steal enemy carry's damage with Static Link
 * Naga Siren's Ensnare ability helps razor to fully steal enemy carry's damage with Static Link

Others

 * Entry
 * Entry
 * Entry

List of heroes that counter Naga Siren, and list of heroes that work well with Naga Siren.