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