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

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

Ghostblade Eidolon

Q: What type of card is Ghostblade Eidolon?

Ghostblade Eidolon is an Enchantment Creature — Spirit. Its oracle text reads: "Bestow {5}{W} (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.)Double strike (This creature deals both first-strike and regular combat damage.)Enchanted creature gets +1/+1 and has double strike."

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>Double strike (This creature deals both first-strike and regular combat damage.)<br>Enchanted creature gets +1/+1 and has double strike.