Red Hare

Bestow {4}{w}
Vigilance, First Strike
Whenever Red Hare enters the battlefield, if its controller is not the owner, the controller must either pay its bestow cost and enchant it on another creature, or sacrifice it.
Enchanted creature gets +2/+2, vigilance and horsemanship.
Not only for its abilities, the Red Hare is also known for its loyalty.