It was only available inside random booster packs of the BW#4 Dark Rush series that was released in December, 2011
That said, this looks like a great inclusion to existing Dog strategies
Aeve, Progenitor Ooze All of History, All at Once Amphibian Downpour Arrow Storm Astral Steel Attempted Murder Brain Freeze Captain Lannery Storm Captain Lannery Storm Chatterstorm Cinder Storm Comet Storm Command the Storm Crackling Spellslinger Crow Storm Dragonstorm Elemental Eruption Empty the Warrens Etali, Primal Storm Eye of the Storm Fiery Encore Flusterstorm Galvanic Giant Galvanic Giant Galvanic Relay Grapeshot Ground Rift Hail Storm Hall of Storm Giants Haze of Rage Hindering Touch Hunting Pack Ignite Memories Ion Storm Krosan Adaptation (playtest) Lava Storm Lightning Storm Meteor Storm Mind's Desire Mordor on the March Murmuration Nahiri, Storm of Stone Najal, the Storm Runner Needle Storm Pigment Storm Possibility Storm Prismari, the Inspiration Radstorm Ral, Crackling Wit Ral, Storm Conduit Reaping the Graves Scattershot Siani, Eye of the Storm Spreading Insurrection Sprouting Vines Storm Caller Storm Elemental Storm Entity Storm Fleet Aerialist Storm Fleet Arsonist Storm Fleet Negotiator Storm Fleet Pyromancer Storm Fleet Sprinter Storm Fleet Spy Storm Fleet Swashbuckler Storm God's Oracle Storm Herald Storm Sculptor Storm Seeker Storm Shaman Storm Skreelix Storm Spirit
Its naturally weaker in 1v1 formats, as boards usually wont have 13 creatures on them, so cards like Damnation become better options
