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With no cards in hand to exile, Forsaken City will untap. I don't think it is supposed to work that way. Shouldn't you be required to exile a card to untap? If you don't have any cards to exile, then the first condition is not met. Consequently, you cannot untap Forsaken City.

I'm wondering if there could have been another card in play that could have overridden that drawback.

timmermac wrote:I'm wondering if there could have been another card in play that could have overridden that drawback.

I've had a look and its definitely a bug that can be replicated with no other cards in play. There's something in the cost setup that allows 0 cards to be exiled. This seems to be the case because with no cards to exile you can either exile 0 cards or cancel, whereas it should allow cancelling only in this situation. This is probably necessary somewhere where its an optional additional cost, but I don't think there's a mandatory parameter or minimum number to exile param.