Eryal, The City Lost

At the beginning of your upkeep, if Eryal is in
your graveyard, you don't control a City, and
there aren't any other City cards in your
graveyard, add {c}. This mana doesn't empty
from your mana pool as steps and phases end.
{t}: Add {c}.
Nothing left but the fragments of a story and
the remnants of a people.