Desert of Origins

Ascend (If you control ten or more permanents, you
get the city's blessing for the rest of the game.)
{t}: Add {c}.
{3}, {t}, Sacrifice a Desert: Search your library for
a historic card, reveal it, put it into your hand,
then shuffle your library. Activate this ability
only if you have the city's blessing and only any
time you could cast a sorcery.