Is Spellbinding Soprano legal in Standard, Modern, and Commander?

Spellbinding Soprano is legal in: Legacy, Vintage, Commander.

What type of card is Spellbinding Soprano?

Spellbinding Soprano is a Creature — Human Bard. Its oracle text reads: "Whenever this creature attacks, instant and sorcery spells you cast this turn cost {1} less to cast. Encore {3}{R} ({3}{R}, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)"

Spellbinding Soprano

Creature — Human Bard

Whenever this creature attacks, instant and sorcery spells you cast this turn cost less to cast.

Encore (, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)