Nightcreep 
Instant
Until end of turn, all creatures become black and all lands become Swamps.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL
Instant
Until end of turn, all creatures become black and all lands become Swamps.