Is Nightmarish End legal in Standard, Modern, and Commander?

Nightmarish End is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

What type of card is Nightmarish End?

Nightmarish End is an Instant. Its oracle text reads: "Target creature gets -X/-X until end of turn, where X is the number of cards in your hand."

Instant

Target creature gets -X/-X until end of turn, where X is the number of cards in your hand.

Set Journey into Nyx

Rarity Uncommon

Mana Value 3

Artist Willian Murai

Collector # 76

Scryfall Gatherer

Instant Modern Pioneer Commander

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