Oracle

Tips

 * All of Oracle's spells have great direct synergy with each other.
 * The initial damage from is fully blocked by the 100% magic resistance from, turning it into a strong heal for allies. Other sources do bonus damage though, so it can backfire if timed poorly.
 * is purgeable, so can remove the healing effect of it, turning it into a strong instant nuke with no heal for enemies.
 * doubles all healing received during it, including the healing of, making it heal a total of 198/216/324/432 health if the spell's damage is taken into account.
 * , and  together on one ally effectively makes it heal for 198/396/594/792 health once the ultimate expires, since the damage is blocked by the 100% magic resistance and the heal doubled by the ultimate.
 * in combination with, or  can grant a hero 100% magic resistance and 100% resistance against physical damage, so only pure damage is able to harm them.

Trivia

 * Oracle made his first official Dota 2 appearance in the comic "The Contract", revealed on the 14th of November 2014 in the official Dota2 blog.
 * Mike Shapiro (Oracle's voice actor) is also well-known for voicing Barney Calhoun and G-Man, two prominent characters in the Half-Life series, with his lines of "Prepare for unforeseen consequences", and "Is it really that time again?" referencing those of G-man's lines in Half-Life 2: Episode 2, and Half-Life 2 respectively.
 * The line "So it goes" is a reference to the novel Slaughterhouse-Five, by Kurt Vonnegut. In the novel, it is a phrase used by the aliens, known as Tralfamadorians, who perceive all time simultaneously.
 * Oracle's prophecy line for Lion is a reference to the first book in The Chronicles of Narnia book series by C.S. Lewis, titled "The Lion, the Witch, and the Wardrobe".
 * The prophecy line for Void "You ought to read Chronosphere of a Death Foretold. It's a prophetic book" is a reference to the book called "Chronicles of a Foretold Death", written by Gabriel García Márquez.
 * The Oracle's Phophecy to Viper : "V is not for visions of victory, but for a victim of a vicious viper." is a reference to the quote of V of Vendetta.
 * The Oracle's prophecy to Chaos Knight "Beware the knight who commandingly demands: do you even rift?" might be a reference to the famous internet meme: Do you even lift?