Wormhole

{t}: Add {1} to your mana pool.
{x}, {t}: Search your library for X permanents, reveal them and put them on your hand, then, if Wormhole have no time counters on it, put 2 time counters on Wormhole. (At the beginning of your upkeep, remove a time counter from Wormhole. When the last time counter is removed, exile Wormhole.)