Forsaken City

This land 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 this land.
{T}: Add one mana of any color.

The List

Planeshift

Forsaken City doesn't untap during your untap step.
At the beginning of your upkeep, you may remove a card in your hand from the game. If you do, untap Forsaken City.
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T: Add one mana of any color to your mana pool.

You may choose to exile a card in your hand even if Forsaken City is already untapped.