Is Amareth, the Lustrous legal in Standard, Modern, and Commander?

Amareth, the Lustrous is legal in: Legacy, Vintage, Commander.

Amareth, the Lustrous

Q: What type of card is Amareth, the Lustrous?

Amareth, the Lustrous is a Legendary Creature — Dragon. Its oracle text reads: "Flying Whenever another permanent you control enters, look at the top card of your library. If it shares a card type with that permanent, you may reveal that card and put it into your hand."

Legendary Creature — Dragon

Flying

Whenever another permanent you control enters, look at the top card of your library. If it shares a card type with that permanent, you may reveal that card and put it into your hand.

Set Commander Legends

Rarity Rare

Mana Value 6

Artist Lie Setiawan

Collector # 266

Scryfall Gatherer