Skanos, Black Dragon Vassal 
Legendary Creature — Dragon Ranger
Menace Whenever Skanos, Black Dragon Vassal attacks, another target attacking creature gains menace and gets +X/+0 until end of turn, where X is Skanos's power.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL