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Card Details
, Exile a creature you control: Put a storage counter on this land.
: Add 
for each storage counter on this land.
Illustrated by Tom Wänerstrand
Rulings (2)
Oct 4, 2004
The storage counters aren't removed when you activate the mana ability.
Oct 1, 2009
You can activate City of Shadows's second ability while it has no storage counters on it, though it won't add any mana in this case. You did not tap it for mana, though, in case any abilities (such as the ability of a Fertile Ground enchanting it) care about that.
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