Is Spelljack legal in Standard, Modern, and Commander?

Spelljack is legal in: Legacy, Vintage, Commander.

Spelljack

Q: What type of card is Spelljack?

Spelljack is an Instant. Its oracle text reads: "Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard. You may play it without paying its mana cost for as long as it remains exiled. (If it has X in its mana cost, X is 0.)"

Instant

Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard. You may play it without paying its mana cost for as long as it remains exiled. (If it has X in its mana cost, X is 0.)

Set Judgment

Rarity Rare

Mana Value 6

Artist Pete Venters

Collector # 51

Scryfall Gatherer