Tinker/Counters

Bad against...

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Others

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Items

 * Blademail can reflect a lot of damage into Tinker's HP specially while using March of the Machines
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Good against...

 * Tinker can deal a great amount of damage against Shadow Fiend's low HP at early game while using a good combination of Laser and Heat-Seeking Missile
 * Laser can make Shadow Fiend miss a lot of last hits, disabling his Necromastery


 * Tinker can easily farm and kill Nature's Prophet treants by using March of the Machines
 * It's effective against Nature's Prophet pushing by using Rearm and Boots of Travel


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Others

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Works well with...

 * Faceless Void can help him with the pushing type


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Others

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