Is Unexplained Absence legal in Standard, Modern, and Commander?

Unexplained Absence is legal in: Legacy, Vintage, Commander.

Unexplained Absence

Q: What type of card is Unexplained Absence?

Unexplained Absence is an Instant. Its oracle text reads: "For each player, exile up to one target nonland permanent that player controls. For each permanent exiled this way, its controller cloaks the top card of their library. (To cloak a card, put it onto the battlefield face down as a 2/2 creature with ward {2}. Turn it face up any time for its mana cost if it's a creature card.)"

Instant

For each player, exile up to one target nonland permanent that player controls. For each permanent exiled this way, its controller cloaks the top card of their library. (To cloak a card, put it onto the battlefield face down as a 2/2 creature with ward . Turn it face up any time for its mana cost if it's a creature card.)