Origami Unicorn

Wondrous item, very rare
  Over the course of a minute, you can fold this enchanted paper into a six-inch long unicorn, activating its magical potential for the next hour. After this hour elapses, the unicorn can’t be used again until the following dawn.
  Messenger. Able to traverse through the border ethereal, this device is used by agents of the Bureau to send missives back home while remaining undercover. When you craft this origami animal, you can speak a message no longer than twenty five words, which are magically transcribed onto the unicorn’s paper, as well as the name of a creature with whom you are familiar. Once completed, the unicorn slips through a portal into the border ethereal, galloping along its shores until it enters the target creature’s plane of existence, at a point near to the creature. The recipient can unfold the unicorn to read the message and then re-fold it, giving a response no more than twenty-five words long, which the unicorn delivers to its origin.
  You can send the message across any distance and even to other planes of existence, but if the target is on a different plane than you, there is a 5 percent chance that the message doesn’t arrive and the unicorn is lost. Each message takes 10 minutes to travel to the destination, allowing a total of three messages to be sent back and forth per day.
  Celestial Steed. When you fold this paper you can speak its command word, causing the origami shape to manifest into a Large unicorn made of paper for the next hour. This creature has the stats of a unicorn with a flying speed equal to its walking speed. The unicorn is friendly to you and obeys your telepathic commands (no action required by you), and rolls its own initiative in combat. If you don’t issue any commands to the unicorn, it defends itself from hostile creatures, but otherwise takes no actions.
  After the hour elapses, or if the unicorn drops to 0 hit points, the paper loses its magic and shrinks back down into a mundane piece of folded paper.