Ogre Magi

Aggron Stonebreak, the Ogre Magi is a melee intelligence hero famous for his random potential for extreme burst damage and his enormous health pool for an intelligence Hero. He has good base attributes, and some of the best attributes gain in the game, having a very high base strength, as well as the highest strength gain of any intelligence hero by far. Coupled with his high base armor and high HP regeneration, Ogre Magi is very hard to take down in the early game. He is a powerful ganker and disabler, slowing his enemies first with an Ignite, then proceeding to eliminate his opponents with Fireblast. Later in the game he takes on the role of a buffer/debuffer with his powerful Bloodlust buff, buffing his carry's damage potential exponentially. And if you happen to be skilled enough, his ultimate Multicast gives him the opportunity to randomly cast his spells multiple times, allowing for great burst potential. Ogre Magi is a very strong disabler, requiring nothing but a bit of luck to successfully pull off his powerful Multicasts.

Tips

 * Fireblast gives the full 1.5s of stun from the first level, whereas Ignite gains significant additional slow and duration with levels. However, Fireblast will deal high damage if it's leveled and Multicast occurs, so choose your ability build wisely.
 * It may seem wise to delay leveling Multicast to preserve the mana efficiency of Fireblast, but remember that Ignite has no area-of-effect until there is at least one level in your Ultimate. This makes farming and pushing creep waves much more difficult. By delaying Multicast, you'll be delaying your farming effectiveness which can put you behind for the rest of the game. For most games, the utility of AOE damage makes higher mana costs an acceptable trade-off. Consider the state of the game and your situation when deciding whether to level Multicast at 6.
 * When you have at least 1 point in Multicast, use Ignite when the enemies get clumped to affect them all in a short radius.
 * Bloodlust is a rather versatile ability, allowing you or anyone you cast it on to make a swift escape or entrance during teamfights, as well as being a powerful steroid for any carry. Consider keeping your Bloodlust always on a carry during a teamfight.
 * You're a good chaser: your Fireblast can stun an enemy for 1.5 seconds and keep him in place, while your Ignite damages and slows the target. Use these abilities to help your teammates get kills.
 * Ogre Magi has the second highest Effective Hit-Point total at level 1 in the game (behind Spirit Breaker), while also being one of the few heroes with exceptionally high base health regeneration. You should use this along with your powerful right click damage to harass enemies out of lane early on, as almost any hero who trades hits with you will come off worse.