Is Aven Squire legal in Standard, Modern, and Commander?

Aven Squire is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Aven Squire

Q: What type of card is Aven Squire?

Aven Squire is a Creature — Bird Soldier. Its oracle text reads: "Flying Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.) *When the meek charge into battle, courage becomes infectious.* Power/Toughness: 1/1"