Is Vernal Equinox legal in Standard, Modern, and Commander?

Vernal Equinox is legal in: Legacy, Vintage, Commander.

What type of card is Vernal Equinox?

Vernal Equinox is an Enchantment. Its oracle text reads: "Any player may cast creature and enchantment spells as though they had flash."

Enchantment

Any player may cast creature and enchantment spells as though they had flash.

Set Mercadian Masques

Rarity Rare

Mana Value 4

Artist Rebecca Guay

Collector # 283

Scryfall

Enchantment Flash Commander Legacy Vintage