Well! Looks like Storm has a new toy. If you are using a mana base with the goal of losing to Null Rod / Stony Silence, this is like Gush on steroids. It "costs" 4, but that's deceptive because it also resets any mana rocks you tapped to cast it. If you return a Sol Ring and a few Mox to your hand, it's basically free. I can easily imagine this snowballing, too, since each one you deploy resets your mana for the next time.