Ogre Magi + Omniknight

Why this works

Trying to burst down a core backed by both these heroes can be an awkward experience. Omniknight can apply a strong defensive buff like Heavenly Grace to dispel stuns and provide resistance, while Ogre Magi simultaneously casts Bloodlust on the same target. This means the hero you are trying to kill is not only surviving the initial gank attempt, but also hitting you back much faster for the duration. It forces opponents to either over-commit to a single kill or back off entirely when they otherwise might have had an advantage.

This pairing often centers on enabling a single right-clicking carry from the mid-game onward. Ogre Magi offers the offensive scaling and Omniknight provides the survivability to let that core play aggressively. However, this strategy puts a lot of faith in one hero. Enemies can often play around it by disengaging when they see key spells like Guardian Angel get used, waiting out the timers before re-initiating the fight. The entire game plan can also be vulnerable to dispels, which can strip away the Bloodlust and leave the protected core without enough damage to finish the job.