Is Mob Mentality legal in Standard, Modern, and Commander?

Mob Mentality is legal in: Legacy, Vintage, Commander.

What type of card is Mob Mentality?

Mob Mentality is an Enchantment — Aura. Its oracle text reads: "Enchant creatureEnchanted creature has trample.Whenever all non-Wall creatures you control attack, enchanted creature gets +X/+0 until end of turn, where X is the number of attacking creatures."

Mob Mentality

Enchantment — Aura

Enchant creature<br>Enchanted creature has trample.<br>Whenever all non-Wall creatures you control attack, enchanted creature gets +X/+0 until end of turn, where X is the number of attacking creatures.

Set Visions

Rarity Uncommon

Artist Douglas Shuler