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

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

Ancient Silver Dragon

Q: What type of card is Ancient Silver Dragon?

Ancient Silver Dragon is a Creature — Elder Dragon. Its oracle text reads: "Flying Whenever this creature deals combat damage to a player, roll a d20. Draw cards equal to the result. You have no maximum hand size for the rest of the game."

Creature — Elder Dragon

Flying

Whenever this creature deals combat damage to a player, roll a d20. Draw cards equal to the result. You have no maximum hand size for the rest of the game.

Set Commander Legends: Battle for Baldur's Gate

Rarity Mythic Rare

Mana Value 8

Artist Raoul Vitale

Collector # 56

Scryfall Gatherer