Is Undead Leotau legal in Standard, Modern, and Commander?

Undead Leotau is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Undead Leotau

Q: What type of card is Undead Leotau?

Undead Leotau is a Creature — Zombie Cat. Its oracle text reads: "{R}: This creature gets +1/-1 until end of turn. 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.)"

Creature — Zombie Cat

: This creature gets +1/-1 until end of turn.

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.)