Is Nimbus Naiad legal in Standard, Modern, and Commander?

Nimbus Naiad is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Nimbus Naiad

Q: What type of card is Nimbus Naiad?

Nimbus Naiad is an Enchantment Creature — Nymph. Its oracle text reads: "Bestow {4}{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.)FlyingEnchanted creature gets +2/+2 and has flying."

Enchantment Creature — Nymph

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.)<br>Flying<br>Enchanted creature gets +2/+2 and has flying.