Is Hypnotic Siren legal in Standard, Modern, and Commander?

Hypnotic Siren is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

Hypnotic Siren

Q: What type of card is Hypnotic Siren?

Hypnotic Siren is an Enchantment Creature — Siren. Its oracle text reads: "Bestow {5}{U}{U} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.) Flying You control enchanted creature. Enchanted creature gets +1/+1 and has flying. Power/Toughness: 1/1"

Enchantment Creature — Siren

Bestow (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)