Slardar

Slardar is a Melee Initiator/Carry, with high mobility and low cooldowns. He has an area of effect stun and his ultimate is a cheap debuff that both reveals units and significantly reduces their armor.

Basic Strategy
Bash also is a good combo with mask of madness.
 * Amplify Damage is a low mana, low cooldown counter to enemy Heroes with invisibility.
 * Amplify Damage also stacks with armor reducing spells/buffs and items.

Trivia

 * Unlike DotA 1, Amplify Damage is no longer auto-castable.