Storm Spirit/Counters

Bad against...

 * must be cautious around Anti-Mage when using, as it rapidly drains his mana and leaves him susceptible to.


 * Doom's ultimate leaves Storm Spirit helpless in team fights, and an easy kill for Doom's team.

His silence is devastating for you, making you an easy kill for him and his team. He can gank you easily in the early game before your lvl 6, halting any hope of you snowballing out of control.


 * He has two spells which silence you, leaving you completely vulnerable. Should you buy a BKB, he can even silence you through it with his ult if he casts after you activate it. He can also steal your Int, reducing your damage and much needed mana pool and his first skill punishes heroes who spam spells.

His Mana Burn destroys your large mana pool, dealing heavy damage and quickly depleting your main means of damage output and escaping. His stun isn't blocked by Linken's Sphere.

His Ancient Seal will silence you for up to 6 seconds and amplify all magic damage against you, a death sentence if you're caught on your own against his powerful magical barrage. Your slow movement speed also means his Mystic Flare is harder to evade. Consider Black King Bar or at least a Linken's Sphere if you cannot jump him first.

Others

 * Any heroes with stuns or silences like Death Prophet, Lion, Shadow Shaman etc..
 * Heroes that can burn mana such as Invoker. Diffusal Blade carriers such as Phantom Lancer and Riki can also be very annoying for you.
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Items

 * Orchid Malevolence and Bloodthorne hard counter you, not only making you completely helpless but also dealing additional damage to you.
 * Scythe of Vyse stops you from acting for a good duration, giving enemies more than enough time to nuke you down or lock you down further.
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Good against...

 * She is easy prey against your damaging nukes and attacks due to her low health pool, armor and abysmal movement speed. You don't care about any of her spells due to your Ball Lightning, even more so if you have Orchid Malevolence.


 * Sniper cannot withstand your combo during the early to midgame and has absolutely no way to escape you save for teammates. You can dodge his assassinate with a correctly timed Ball Lighting.


 * You're a natural Orchid carrier, which when combined with your combo virtually guarantees a kill against unwary Embers. You can Ball Lighting even when hit by his Searing Chains and your magical damage eats through his Flame Guard quickly.


 * She finds it hard to pin you down and auto attack you due to your high mobility. Your overcharge right click will burn two instances of her Refraction instead of one.


 * You are a perfect counter to Tinker as you can initiate on him even when he's far back or in the trees and you'll usually have enough damage to take him down before he can teleport out. He does well against you in lane, however.

You can hunt down Arc Warden with your Ball Lightning and kill him quickly due to his low health and complete lack of escape mechanisms. None of his abilities threaten you, assuming you have enough mana, even when he has a Tempest Double up.

Others

 * Squishy heroes or heroes without hard disables or silences: Shadow Demon, Shadow Fiend, Venomancer, Ancient Apparition etc..
 * Heroes that rely on their high mobility such as Queen of Pain, Slark and Weaver can be constantly engaged against due to your excellent ability to chase over any terrain. Make sure you carry dust for Invisible heroes that could potentially escape your clutches.
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Works well with...

 * In the early game, the occasional cast of can top up Storm Spirit's mana pool, and allow him to leverage one or two more spells in between runes.


 * Repel allows you to jump in and wreak havoc on enemies with little fear of being disabled. His heal keeps you going and can damage enemies you engage with your pull.


 * The classic Naix bomb, a Lifestealer infested inside you makes for a devastating combo against lone targets and is the perfect way for the otherwise immobile Lifestealer to engage in melee combat.


 * His Essence Aura will restore a huge amount of mana to you when it procs due to your tendency to build up a large mana pool. The spammability of your spells means that it will proc very often in an engagement, ensuring you can remain mobile and aggressive.


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Others

 * Tanky intiators that can disable groups of enemies and bear the brunt of spells and disables, allowing you to zip in to weakened or squishy targets and kill them without fear of rebuttal: Clockwerk, Centaur Warrunner, Tidehunter.
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List of heroes that counter Storm Spirit, and list of heroes that work well with Storm Spirit.