Timmeh, the Harbinger

Whenever you cast a creature spell with converted mana cost 5 or more, put two +1/+1 counters on Timmeh, the Harbinger, then draw
a card.
{4}, {t}, Remove two +1/+1 counters from Timmeh, the Harbinger: Search your library for
a legendary creature card, reveal it, then shuffle your library and put that card on top of it.