Is Shield Wall legal in Standard, Modern, and Commander?

Shield Wall is legal in: Legacy, Vintage, Commander, Pauper.

What type of card is Shield Wall?

Shield Wall is an Instant. Its oracle text reads: "Creatures you control get +0/+2 until end of turn."

Instant

Creatures you control get +0/+2 until end of turn.

Set Legends

Rarity Uncommon

Artist Douglas Shuler

Instant Commander Pauper Legacy