Is Second Wind legal in Standard, Modern, and Commander?

Second Wind is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Second Wind?

Second Wind is an Enchantment — Aura. Its oracle text reads: "Enchant creature {T}: Tap enchanted creature. {T}: Untap enchanted creature. *Vindr stormchasers believe that the same ancient forces that move the winds can also move mortal minds and hearts.*"