{T}, Exile a creature you control: Put a storage counter on this land.
{T}: Add {C} for each storage counter on this land.
Legalities
tlrlegal
duellegal
brawlnot legal
pennynot legal
PreDH
Rulings · 2
wotc
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.
wotc
The storage counters aren't removed when you activate the mana ability.
Notes
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