Is Planeswalker's Mischief legal in Standard, Modern, and Commander?

Planeswalker's Mischief is legal in: Legacy, Vintage, Commander.

Planeswalker's Mischief

Q: What type of card is Planeswalker's Mischief?

Planeswalker's Mischief is an Enchantment. Its oracle text reads: "{3}{U}: Target opponent reveals a card at random from their hand. If it's an instant or sorcery card, exile it. You may cast it without paying its mana cost for as long as it remains exiled. At the beginning of the next end step, if you haven't cast it, return it to its owner's hand. Activate only as a sorcery."

Enchantment

: Target opponent reveals a card at random from their hand. If it's an instant or sorcery card, exile it. You may cast it without paying its mana cost for as long as it remains exiled. At the beginning of the next end step, if you haven't cast it, return it to its owner's hand. Activate only as a sorcery.