Is Corpse Connoisseur legal in Standard, Modern, and Commander?

Corpse Connoisseur is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Corpse Connoisseur?

Corpse Connoisseur is a Creature — Zombie Wizard. Its oracle text reads: "When this creature enters, you may search your library for a creature card, put that card into your graveyard, then shuffle. Unearth {3}{B} ({3}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)"

Corpse Connoisseur

Creature — Zombie Wizard

When this creature enters, you may search your library for a creature card, put that card into your graveyard, then shuffle.

Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)