City of Solitude

Oracle Text

Players can cast spells and activate abilities only during their own turns.

Card Rulings

10/4/2004 City of Solitude can affect abilities of cards that are not on the battlefield because it prevents players from activating those abilities.
10/4/2004 City of Solitude does not stop triggered abilities from being put on the stack. They are never “activated”.
10/1/2009 This stops players from activating mana abilities.