Ashton Selective Summoner

+1: Exile target nonland card from a graveyard. Create X 1/1 elemental creature tokens where X is the exiled cards colourless mana cost.
-3: Discard a creature card. Search your library for a creature with power X where X is the discarded creatures power. Put it on top of your library.
-12: You get an emblem with Whenever a player casts a noncreature spell you create an X/X elemental token where X is that spells converted mana cost.