General Mills announced the self-described "unicorn of the cereal world," marshmallow-only Lucky Charms, and has the "Clown Prince of Hip-Hop, Biz Markie," to help spread the message.

In the promotion, Biz Markie gives his 1988 hit "Just A Friend" the remix treatment and shows viewers in a colorful display why a marshmallow-only box of the cereal is so appealing, according to All HipHop.

The reason why these boxes are referred to as unicorns is because there are only 10 of them in the world, reported Newsmax. Ten lucky winners will have the chance to obtain this rare cereal when they're given out as prizes in the "Lucky Charms Lucky Selfie" contest, which asks fans to post pictures of themselves holding "imaginary boxes of Lucky Charms" on Facebook, Twitter or Instagram using the hashtag, #Lucky10Sweepstakes.

"A box of Marshmallow Only Lucky Charms has always been the unicorn of the cereal world - fantasized about, but never seen," General Mills said on its website. "The Lucky Charms team receives countless calls, emails, tweets and Facebook posts from marshmallow-obsessed fans longing for a box filled with only the magically-delicious marshmallows."

Anyone who wants a chance at this "unicorn of the cereal world" is urged to act quickly, as the company said entries must be posted by Oct.18.