Rubick

Rubick the Grand Magus is the ranged Intelligence hero best known for his ability to copy the spells of his enemies and use them as his own. Spell Steal allows Rubick to cast an enemy hero's most recently used spell, giving him supreme versatility throughout the game. By stealing the right abilities, the Grand Magus can aid himself and allies by casting crippling disables, applying curses, unleashing powerful nukes, disorienting the enemy team, supporting his allies with buffs, escaping from rough situations, or enhancing his own physical attacks. His other abilities are just as worthy of a Magus: Telekinesis lets Rubick magically lift an enemy into the air, rendering the target helpless and vulnerable, before hurling the lifted enemy to the ground and stunning nearby foes on impact. Fade Bolt blasts enemies with a stream of arcane energy which bounces to all enemies nearby, dealing damage and reducing their attack damage. Null Field is a passive aura, which grants himself and nearby allied heroes bonus magic resistance to shrug off magical assaults. Rubick's versatile skill-set and his infamous Spell Steal make the Grand Magus a flexible and powerful hero.

Tips

 * Both his Telekinesis and his Fade Bolt have a high mana cost. 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.
 * Fade Bolt harassment makes you a powerful midlane hero, since the attack damage reduction secondary effect also makes it more difficult for your opponent to lasthit properly.
 * 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 or Sand King's Epicenter will still require Rubick to channel).
 * If you are in a side lane, try laning with partners that have powerful nukes, attacks or stuns even in the early game. Heroes such as Juggernaut, Bane, Zeus, Skeleton King, Chaos Knight, Luna and Ogre Magi are perfect, as target-point abilities can be used on enemy heroes Rubick is holding in mid-air.
 * Rubick is also a good partner for Heroes with a difficult to land stun/nuke. Kunkka, Alchemist, Lina, Jakiro, Leshrac, Ancient Apparition or even Invoker with his Sun Strike will greatly benefit from your Telekinesis.
 * Morph Strength Gain is a good spell to steal as it allows you to morph all Agility into Strength permanently, even if you lose the ability.
 * Stolen Psionic Traps do not get destroyed when you lose the spell, and can be very useful to set up permanent vision of rune spots, Roshan, ancient camps and other key spots on the map. If you lose this spell and steal it again, you may still set 5/8/11 traps (depending on the level of the stolen spell) without destroying the other traps. This can give your team a great vision advantage since the number of traps you can set is virtually limitless.
 * Anti Mage's Blink is a great spell to steal since it gives Rubick the mobility he needs, and has lower cooldown and manacost compared to Blink Dagger. Having both will give Rubick a tremendous escape/initiation mechanism!
 * A stolen Meat Hook can be extremely useful to initiate teamfights. Most enemy heroes won't expect to be hooked, which causes them to be less careful about their positioning. The same goes for Mirana's Sacred Arrow.
 * Rubick benefits from Meat Hook and Nether Swap combining it with Blink Dagger, which is forbidden for Pudge and Vengeful Spirit but not for Rubick!
 * Spell Steal cannot steal passive abilities, but stealing Slark's Shadow Dance will give Rubick the passive regeneration and movespeed.
 * Be careful when stealing spells from Keeper of the Light. If you steal a spell used with Spirit Form right after its duration ends, the spell will be inactive!
 * You can convert creeps using Chen's Holy Persuasion, but all converted creeps die once you lose the spell. The same goes for Lone Druid's Spirit Bear.
 * Storm Spirit's Ball Lightning, when stolen by Rubick, has its manacost adjusted for Rubick's mana pool.
 * A stolen Broodmother's Spin Web will give Rubick the invisibility and everything else. It does not interact with Broodmother at all, and do not disappear when the spell is lost.

Trivia

 * In both DotA and Dota 2, he is the son of Aghanim.
 * If Rubick acquires Tusk's Walrus Punch skill, he will cast it as a projectile on the target by throwing a spinning, projectile form of himself toward them. When targeted on Tusk himself, the text "Sucker Punch!" will be displayed, in green colors. The caption will be changed to "Stolen Punch!" when hitting creeps and other heroes.
 * If Rubick steals Lycanthrope's Shapeshift, he will transform into the same wolf model, though slightly smaller in scale compared to Lycan. He still retains his ranged attack, able to use the critical passive that comes with the skill.
 * His response "Now, where's my cube" is a reference to Rubik's Cube, a popular combination puzzle.
 * In DotA, Rubick couldn't steal several spells due to technical limitations. The complete list can be found here.