How to counter Anti-Mage in Dota 2

Burns an opponent's mana on each attack and deals damage equal to a percentage of the mana burnt.

Short distance teleportation that allows Anti-Mage to move in and out of combat.

Passively grants magic resistance. Counterspell may be activated to create an anti-magic shell around Anti-Mage that blocks and reflects any targeted spells.

Attacks slow enemies based on how much mana they are missing. Min slow at 50% mana, up to max slow at 0% mana. No effect if enemy is above 50% mana.

For each point of mana missing by the target unit, damage is dealt to it and surrounding enemies. The main target is also mini-stunned.