Forsaken City doesn't untap during your untap step.
At the beginning of your upkeep, you may exile a card from your hand. If you do, untap Forsaken City.
: Add one mana of any color.
When Mesmeric Fiend enters the battlefield, target opponent reveals their hand and you choose a nonland card from it. Exile that card.
When Mesmeric Fiend leaves the battlefield, return the exiled card to its owner's hand.
When Phyrexian Delver enters the battlefield, return target creature card from your graveyard to the battlefield. You lose life equal to that card's converted mana cost.
, : Destroy target tapped nonblack creature.
, : Search your library for a Mercenary permanent card with converted mana cost 3 or less and put it onto the battlefield. Then shuffle your library.
"Over the silver mountains,
Where spring the nectar fountains,
There will I kiss
The bowl of bliss;
And drink my everlasting fill. . . ."
—Sir Walter Raleigh, "The Pilgrimage"