Is Xanathar, Guild Kingpin legal in Standard, Modern, and Commander?

Xanathar, Guild Kingpin is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Xanathar, Guild Kingpin

Q: What type of card is Xanathar, Guild Kingpin?

Xanathar, Guild Kingpin is a Legendary Creature — Beholder. Its oracle text reads: "At the beginning of your upkeep, choose target opponent. Until end of turn, that player can't cast spells, you may look at the top card of their library any time, you may play the top card of their library, and you may spend mana as though it were mana of any color to cast spells this way. Power/Toughness: 5/6"

Legendary Creature — Beholder

At the beginning of your upkeep, choose target opponent. Until end of turn, that player can't cast spells, you may look at the top card of their library any time, you may play the top card of their library, and you may spend mana as though it were mana of any color to cast spells this way.

Power/Toughness: 5/6

Set Adventures in the Forgotten Realms

Rarity Mythic Rare

Mana Value 6

Artist Kieran Yanner

Collector # 239

Scryfall