Is Ancient Brass Dragon legal in Standard, Modern, and Commander?

Ancient Brass Dragon is legal in: Legacy, Vintage, Commander, Historic.

Ancient Brass Dragon

Q: What type of card is Ancient Brass Dragon?

Ancient Brass Dragon is a Creature — Elder Dragon. Its oracle text reads: "Flying Whenever this creature deals combat damage to a player, roll a d20. When you do, put any number of target creature cards with total mana value X or less from graveyards onto the battlefield under your control, where X is the result."

Creature — Elder Dragon

Flying

Whenever this creature deals combat damage to a player, roll a d20. When you do, put any number of target creature cards with total mana value X or less from graveyards onto the battlefield under your control, where X is the result.

Set Commander Legends: Battle for Baldur's Gate

Rarity Mythic Rare

Mana Value 7

Artist Johan Grenier

Collector # 111

Scryfall Gatherer