Mystique, Forever Hidden

Changeling (This card is every creature type at all
times.)
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
You may have Mystique, Forever Hidden enter
the battlefield as a copy of any creature on the
battlefield. When Mystique, Forever Hidden
enters the battlefield, you may search your
library for a basic land card, put that card onto
the battlefield tapped, then shuffle your library.