Caller of Crathos

{t}: Add {b} or {g} to your mana pool.
If you have a card named Crathos, Elemental Master in your graveyeard Caller of Crathos gets +4/+4.
{2}{g}{g}{b}{t}: Sacrifice Caller of Crathos, search your library for a card named Crathos, Elemental Master, reveal it and put it into your hand. Shuffle your library.