Is Errantry legal in Standard, Modern, and Commander?

Errantry is legal in: Legacy, Vintage, Commander, Pauper.

What type of card is Errantry?

Errantry is an Enchantment — Aura. Its oracle text reads: "Enchant creatureEnchanted creature gets +3/+0 and can only attack alone."

Enchantment — Aura

Enchant creature<br>Enchanted creature gets +3/+0 and can only attack alone.

Set Ice Age

Rarity Common

Artist Allen Williams

Enchantment Commander Pauper Legacy