Is Baleful Eidolon legal in Standard, Modern, and Commander?

Baleful Eidolon is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Baleful Eidolon

Q: What type of card is Baleful Eidolon?

Baleful Eidolon is an Enchantment Creature — Spirit. Its oracle text reads: "Bestow {4}{B} (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.)Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)Enchanted creature gets +1/+1 and has deathtouch."

Enchantment Creature — Spirit

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>Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)<br>Enchanted creature gets +1/+1 and has deathtouch.