Ode to Lost Souls

Gravestorm When you cast this spell, put a copy of it onto the stack for each permanent that was put into a graveyard from the battlefield this turn. If the spell has any targets, you may choose new targets for any of the copies.
Search your library for a creature card with converted mana cost X or less where X is the total number of creature cards in your Graveyard. Put that creature card onto the battlefield, then shuffle your library.