Is Thieving Amalgam legal in Standard, Modern, and Commander?

Thieving Amalgam is legal in: Legacy, Vintage, Commander.

Thieving Amalgam

Q: What type of card is Thieving Amalgam?

Thieving Amalgam is a Creature — Ape Snake. Its oracle text reads: "At the beginning of each opponent's upkeep, you manifest the top card of that player's library. (Put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.) Whenever a creature you control but don't own dies, its owner loses 2 life and you gain 2 life."

Creature — Ape Snake

At the beginning of each opponent's upkeep, you manifest the top card of that player's library. (Put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Whenever a creature you control but don't own dies, its owner loses 2 life and you gain 2 life.

Set Outlaws of Thunder Junction Commander

Rarity Rare

Mana Value 7

Artist Johan Grenier

Collector # 150

Scryfall Gatherer