Pretty sure firsttwo cards are mono-white now. The lasttwo are staple black effects, though.
Dirge was a planar chaos take on kor chant showing that the card was almost in Black's color pie. Sudden spoiling resembles a blue effect mass diminish more than humble but that one seems to bleed either way (sorceress queen, humility, etc)
Kor Dirge is a planeshift of Kor Chant, so yeah the effect is in white for the most part. Remember cards from Planar Chaos were alternate reality versions of existing cards so anything could happen.
Other than that pretty good reprints and Read the Bones looks STELLAR in that frame.
EDIT: ACtually, that damage redirection thing was initially in black with Simulacrum. So it technically kinda fits under the old "colour pie" assortment that never was really bound to a particular structure like it is now.