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.