Is Soulless One legal in Standard, Modern, and Commander?

Soulless One is legal in: Legacy, Vintage, Commander.

Soulless One

Q: What type of card is Soulless One?

Soulless One is a Creature — Zombie Avatar. Its oracle text reads: "Soulless One's power and toughness are each equal to the number of Zombies on the battlefield plus the number of Zombie cards in all graveyards. *"Surrender your soul to me."* Power/Toughness: */*"