New Troop - Unicorn

The unicorn is a transport of sorts. It will pick up the closest friendly troop to increase that troops speed by 2X. The unicorn deals no damage nor heals troops, only increases their speed. However, when a troop mounts the unicorn it does regain full health. The unicorn, like hogs, can jump walls even while transporting another unit. The unicorn can only carry one troop at a time but never dies. Once its passenger dies it seeks another. The unicorn is controlled by its passenger so its attack path will reflect the same route.

Hitpoints are irrelevant
2500 elixer to train
15 min training time
5 housing space

The unicorn will not transport flying units, king, queen, hogs, PEKKA or golem.

*If all troops are dead except the unicorn, the attack will end.

Let me know what you think!

Its very creative. I think that the unicorn should also increase the range of troops. Also, what happens when you level the unicorn up? Dose it gain more speed?