When Devoted Grafkeeper enters the battlefield, mill two cards. Whenever you cast a spell from your graveyard, tap target creature you don't control. Disturb {1}{W}{U} (You may cast this card from your graveyard transformed for its disturb cost.)

Flying Departed Soulkeeper can block only creatures with flying. If Departed Soulkeeper would be put into a graveyard from anywhere, exile it instead.