Tome Delver

Magic Delve {1} (For each instant or sorcery you exile from your graveyard while casting this pays for {1}.)
For each instant and/or sorcery you exile to cast this put one knowledge counter on Tome Delver.
While there are knowledge counters on Tome Delver it can't attack or block. At the begging of your upkeep remove a knowledge counter from tome delver search your library for an instant or sorcery card and put it into your hand.