Is Voracious Null legal in Standard, Modern, and Commander?

Voracious Null is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper.

Voracious Null

Q: What type of card is Voracious Null?

Voracious Null is a Creature — Zombie. Its oracle text reads: "{1}{B}, Sacrifice another creature: Put two +1/+1 counters on this creature. Activate only as a sorcery. *"These days, there's no shortage of food for the nulls of Guul Draz." —Drana, Kalastria bloodchief* Power/Toughness: 2/2"