Changeling Champion

Changeling. Whenever you sacrifice a construct, draw a card. Whenever you sacrifice a nightmare, each opponent loses 2 life, and you gain 2 life. Whenever you sacrifice a thopter, creatures you control gain flying until the end of the turn. Whenever you sacrifice a shark, your creatures cannot be blocked this turn. Whenever you sacrifice a Gnome, search your library for a basic land and put it onto the battlefield. Whenever you sacrifice a beeble, gain 5 life.