Silumgar, the Drifting Death 
Legendary Creature — Dragon
Flying, hexproof Whenever a Dragon you control attacks, creatures defending player controls get -1/-1 until end of turn.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL