Runyx, Eternities Shepherd

{g}, {t}: Prevent all combat damage that would
be dealt this turn. Untap Runyx at the
beginning of the next endstep.
{w}{u}, {t}: Counter target noncreature spell.
You gain 2 life and draw a card.
{x}{g}{w}{u}, {t}: Search your library for a
permanent card with converted mana cost X,
put it into play, then shuffle your library.