Is Nightsky Mimic legal in Standard, Modern, and Commander?

Nightsky Mimic is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Nightsky Mimic

Q: What type of card is Nightsky Mimic?

Nightsky Mimic is a Creature — Shapeshifter. Its oracle text reads: "Whenever you cast a spell that's both white and black, this creature has base power and toughness 4/4 until end of turn and gains flying until end of turn."

Creature — Shapeshifter

Whenever you cast a spell that's both white and black, this creature has base power and toughness 4/4 until end of turn and gains flying until end of turn.

Set Eventide

Rarity Common

Mana Value 2

Artist Franz Vohwinkel

Collector # 91

Scryfall Gatherer