Is First-Sphere Gargantua legal in Standard, Modern, and Commander?

First-Sphere Gargantua is legal in: Modern, Legacy, Vintage, Commander, Pauper, Historic.

What type of card is First-Sphere Gargantua?

First-Sphere Gargantua is a Creature — Phyrexian Horror. Its oracle text reads: "When this creature enters, you draw a card and you lose 1 life. Unearth {2}{B} ({2}{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.)"

First-Sphere Gargantua

Creature — Phyrexian Horror

When this creature enters, you draw a card and you lose 1 life.

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.)