Is Word of Undoing legal in Standard, Modern, and Commander?

Word of Undoing is legal in: Legacy, Vintage, Commander, Pauper.

What type of card is Word of Undoing?

Word of Undoing is an Instant. Its oracle text reads: "Return target creature and all white Auras you own attached to it to their owners' hands."

Instant

Return target creature and all white Auras you own attached to it to their owners' hands.

Set Ice Age

Rarity Common

Artist Christopher Rush

Instant Commander Pauper Legacy