Obelisk of Nundenka

{p/c},{t}: Add {c}{c} to your mana pool.
{7},{t}, Sacrifice Obelisk of Nundenka: Search
your library for an artifact creature card with converted mana cost 6 or less and put it onto the battlefield. It gains haste. Exile it and the beginning of the next end step.
Legend tells of a secret creature sealed inside the iconic obelisk. With the proper magic, it may be unleashed.