Rubick

Rubick the Grand Magus is a ranged Intelligence hero who features the unique ultimate Spell Steal, which lets you capture an ability from any opposing Hero and use it as your own for several minutes. Because he isn't complete without a stolen ability in his arsenal, his strength will depend on how good the player is at spotting enemies who leave powerful abilites open to be stolen, and how these abilities are utilized.

The rest of his kit lends itself well to pushing down creep waves, ganking enemy heroes, and dominating team fights. Rubick is recommended for experienced players who possess at least a cursory understanding of every Hero in the game and their abilities.

Tips

 * Telekinesis is most wisely used to disable enemy support heroes in an encounter. Conversely, Fade Bolt should be aimed squarely at enemy carries.
 * Do not underestimate Fade Bolt as an offensive spell. Its damage is significant and its range is huge.
 * If the enemy team has strong magical nukers such as Lina or Queen of Pain, Null Field should be maxed early.
 * Rubick is a very good pick when the enemy has these sorts of heroes; as besides reducing their damage output he can steal their nukes for himself.
 * Your Spell Steal is best used early-game to steal initiator abilities, like Tidehunter's Ravage and Earthshaker's Fissure. You can also steal enemy carry abilities to counter them; for example stealing Bounty Hunter's Track and using it on him.
 * Rubick is frail, and is suited to attacking from a distance. However, if he Spell Steals powerful initiation abilities he will sometimes be required to endanger himself. It is best to adapt Rubick's build to whatever stolen spells define his role, which will usually be ascertained via enemy team composition (if they have an Enigma, build like Enigma; et cetera).
 * Telekinesis can be used to line up people for spells that you steal that have cast times, for instance, you can telekinesis them to hold them in place, then use Invoker's Sun Strike or Kunkka's Torrent.

Trivia

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