Viper is a MARVEL SNAP card that costs 3 energy and has 5 power. It has the effect: "On Reveal: One of your other cards here switches sides."
It has variants that are part of the Chibi, Secret Wars, Steampunk, Venomized, Noir, Post Apocalyptic and Pixel categories.
Viper has synergy with The Hood, Green Goblin, Sentry, Annihilus and Hobgoblin.