Yuumi, the Magical Cat

Bestow {1}{w/u}{w/u}
Enchanted creature gets +4/+4 and flying.
When enchanted creature dies, if Yuumi, the
Magical Cat is an Aura, instead put Yuumi, the Magical Cat onto the battlefield as a creature.
{2}{w/u}{w/u}{w/u}: Attach Yuumi, the Magical Cat as an
Aura to a creature you control.