Chaldea Summoning Chamber

{t}: Add {c} to your mana pool.
{1}, {t}: Put a charge counter on Chaldea Summoning Chamber.
{2}, {t}, Remove three charge counters from Chaldea Summoning Chamber: Search your library or graveyard for a Servant creature card, reveal it, and put it in your hand. If you search your library this way, shuffle it.