Orzhov Keyrune

{T}: Add {W} or {B}. {W}{B}: This artifact becomes a 1/4 white and black Thrull artifact creature with lifelink until end of turn.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oqn0wjom1pb1hh7pdv72z.