Is Elminster legal in Standard, Modern, and Commander?

Elminster is legal in: Legacy, Vintage, Commander.

Elminster

Q: What type of card is Elminster?

Elminster is a Legendary Planeswalker — Elminster. Its oracle text reads: "Whenever you scry, the next instant or sorcery spell you cast this turn costs {X} less to cast, where X is the number of cards looked at while scrying this way. +2: Draw a card, then scry 2. −3: Exile the top card of your library. Create a number of 1/1 blue Faerie Dragon creature tokens with flying equal to that card's mana value. Elminster can be your commander."

Legendary Planeswalker — Elminster

Whenever you scry, the next instant or sorcery spell you cast this turn costs less to cast, where X is the number of cards looked at while scrying this way.