Is Slitherhead legal in Standard, Modern, and Commander?

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

Slitherhead

Q: What type of card is Slitherhead?

Slitherhead is a Creature — Plant Zombie. Its oracle text reads: "Scavenge {0} ({0}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.) *"It makes better use of Uncle Dragi's head than he ever did." —Pesha, retired blacksmith* Power/Toughness: 1/1"

Creature — Plant Zombie

Scavenge (, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)