Finally!

Magic: the Gathering has long been full of a variety of creatures you can summon to murder your opponents. Or do other stuff, I suppose, like defend you from being murdered by your opponents. You've had access to things like dragons, elves, goblins, gargoyles, hydras, really big fish, golems, vampires, wombats, djinn, oozes, badgers, minotaurs, angels, demons, sharks, crabs, shark crabs... even a surprising number of jellyfish (though of course most of the things listed as jellyfish aren't really jellyfish). You've had it all.

No, you haven't. Because, until now, you could not murder your opponents with the lingering souls of dead children.

http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=398628