Wakula of the Mystic Deep

Changeling (This card is every creature type.)

Deathtouch, ward {1}

As Wakula of the Mystic Deep enters the battlefield, choose a creature type.
Whenever a creature you control with the chosen type dies, mill three cards. If a creature that shares a creature type with it was milled this way, you may pay {1}{b}{g/u}. If you do, create a 2/2 colorless shapeshifter creature token with changeling.