Is Elvish Dreadlord legal in Standard, Modern, and Commander?

Elvish Dreadlord is legal in: Legacy, Vintage, Commander.

Elvish Dreadlord

Q: What type of card is Elvish Dreadlord?

Elvish Dreadlord is a Creature — Zombie Elf. Its oracle text reads: "Deathtouch When this creature dies, non-Elf creatures get -3/-3 until end of turn. Encore {5}{B}{B} ({5}{B}{B}, 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.) Power/Toughness: 3/3"

Creature — Zombie Elf

Deathtouch

When this creature dies, non-Elf creatures get -3/-3 until end of turn.

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.)