Is Ashiok, Nightmare Weaver legal in Standard, Modern, and Commander?

Ashiok, Nightmare Weaver is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Ashiok, Nightmare Weaver

Q: What type of card is Ashiok, Nightmare Weaver?

Ashiok, Nightmare Weaver is a Legendary Planeswalker — Ashiok. Its oracle text reads: "+2: Exile the top three cards of target opponent's library.−X: Put a creature card with mana value X exiled with Ashiok, Nightmare Weaver onto the battlefield under your control. That creature is a Nightmare in addition to its other types.−10: Exile all cards from all opponents' hands and graveyards."

Legendary Planeswalker — Ashiok

+2: Exile the top three cards of target opponent's library.<br>−X: Put a creature card with mana value X exiled with Ashiok, Nightmare Weaver onto the battlefield under your control. That creature is a Nightmare in addition to its other types.<br>−10: Exile all cards from all opponents' hands and graveyards.

Set Pioneer Masters

Rarity Mythic Rare

Artist Karla Ortiz