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
 * Meepo

Items

 * Scythe of Vyse
 * Pipe of Insight
 * Orchid of Malevolence
 * Black King Bar

Good against...

 * Ensare, Rip Tide and Song of the Siren cancel Crystal Maiden's ultimate. Her raw movement speed also allows her to catch up with CM for a quick kill.


 * 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...

 * In the early game, you can deal huge amounts of physical damage with if you surround an enemy with your s. This can be setup with  and the damage can be further amplified through armor reduction with.
 * The combination of and  should result in some daring/clutch escapes for you and your allies.
 * Worse for worse, you can always use your song as a means to buy time for to tick into effect, forcing a fight with an armor difference to your advantage.


 * Disruptor's and  can both be casted pre-emptively during Song of the Siren, dooming your enemies before the song ends.
 * There is almost nothing the enemy team can do if they are trapped into both spells and Disruptor also purchased an.


 * will help Razor to fully steal an enemy's damage (preferably their carry in the middle of a fight) with.


 * works very well as a follow up Song of the Siren for perfect teamfights in the early game.
 * In later stages, odds are they will have either a to dodge the Ravage or a  to negate it, wasting your perfect 5-man Sleep.


 * Like Tidehunter, you can use as a follow-up to the Song in the early game.
 * You can also use Ensnare as a set-up for.

Others

 * Any hero that has a good follow-up to your Song:, , ...
 * A special mention goes to as zombies from his  will keep spawning during the Song.

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