Is Isareth the Awakener legal in Standard, Modern, and Commander?

Isareth the Awakener is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Isareth the Awakener

Q: What type of card is Isareth the Awakener?

Isareth the Awakener is a Legendary Creature — Human Wizard. Its oracle text reads: "Deathtouch Whenever Isareth attacks, you may pay {X}. When you do, return target creature card with mana value X from your graveyard to the battlefield with a corpse counter on it. If that creature would leave the battlefield, exile it instead of putting it anywhere else."

Legendary Creature — Human Wizard

$0.15 ↗20 similarCommander, Modern

Deathtouch

Whenever Isareth attacks, you may pay . When you do, return target creature card with mana value X from your graveyard to the battlefield with a corpse counter on it. If that creature would leave the battlefield, exile it instead of putting it anywhere else.