Is Gelid Shackles legal in Standard, Modern, and Commander?

Gelid Shackles is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Gelid Shackles

Q: What type of card is Gelid Shackles?

Gelid Shackles is a Snow Enchantment — Aura. Its oracle text reads: "Enchant creature Enchanted creature can't block, and its activated abilities can't be activated. {S}: Enchanted creature gains defender until end of turn. ({S} can be paid with one mana from a snow source.)"