Is Relentless Advance legal in Standard, Modern, and Commander?

Relentless Advance is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Relentless Advance

Q: What type of card is Relentless Advance?

Relentless Advance is a Sorcery. Its oracle text reads: "Amass Zombies 3. (Put three +1/+1 counters on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)"

Sorcery

Amass Zombies 3. (Put three +1/+1 counters on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

Set War of the Spark

Rarity Common

Mana Value 4

Artist Stanton Feng

Collector # 64

Scryfall Gatherer