Sorcery, 1BG (3)

Destroy target nonland permanent and all other permanents with the same name as that permanent.
During the collision of the shards, entire ways of life disappeared without a trace.
Illus. John Avon

5/1/2009: If the targeted permanent has become an illegal target by the time Maelstrom Pulse resolves, Maelstrom Pulse is countered. Nothing will be destroyed.
5/1/2009: If the targeted permanent isn't destroyed (because it regenerates, or because it's indestructible), all other permanents with the same name as it will still be destroyed.
5/1/2009: A token's name is the same as the creature types listed by the effect that created it, unless that effect specifically gives that token a name. For example, Lich Lord of Unx's effect creates a token with the name "Zombie Wizard."
5/1/2009: A face-down creature has no name, so it doesn't have the same name as anything else.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern