Rubick

Rubick the Grand Magus is a ranged intelligence hero who is infamous for his unique ability to copy the spells of his enemies and utilize them for his own purposes with Spell Steal. Spell Steal allows Rubick to imitate an enemy hero's most recently used spell as his own, which gives him supreme versatility and adaptation throughout the game. With the right abilities stolen, the Grand Magus can aid himself and allies by throwing disables, applying curses, unleashing powerful nukes, disorienting the enemy team, escaping if the situation gets rough, or even enhancing his own physical attacks. The rest of his abilities help with pushing down creep waves, ganking enemy heroes, protecting allies from magical harm, and overall dominating in team fights.

Tips

 * Both his Telekinesis and his Fade Bolt have the same mana cost at all levels. Try to be conservative of your mana early on until you can grab some items such as a Void Stone or a Bottle to accommodate his somewhat high mana costs for the early stages of the game.
 * Against heavy magic damage teams, you may have to invest an early point on Null Field since its percentage reduction will scale into later stages of the game.
 * Although a great disabler and potential initiator with the right items, Rubick is still frail with the proper focus on him. Stay back as much as you can to avoid unnecessary damage and keep casting and stealing spells!
 * Almost all of his spells, including the spells he steals, have no casting time. So spells such as Earthshaker's Fissure and Leshrac's Split Earth will cast immediately. Use this knowledge to your advantage. (Although any spell that require him to channel such as Enigma's Black Hole will still require Rubick to channel.)

Trivia

 * In both DotA and Dota 2 he is the son of Aghanim.