Ghost-Spider, Gwen Stacy 
Legendary Creature — Spider Human Hero
Menace (This creature can't be blocked except by two or more creatures.) Whenever Ghost-Spider attacks, she deals X damage to defending player, where X is the number of attacking creatures.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL