DNA and Dizaster
When he hosted King of the Dot (a Toronto rap battle event) Drake made it well known how excited he was to be there, noting the event and its rappers, DNA and Dizaster. In fact, he was so supportive of this battle and its competitors that he skipped out on filming Future's "Tony Montana" video to host the event.
This wasn't Drake's only stint with KOTD though. Since hosting this battle, Drizzy and Dizaster became close friends. In a later battle against rapper Arcane, Drake and his crew escorted Dizaster to the venue, as Diz gave them a sneak peek at some of the material he'd be dropping.