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Cumulative upkeep {2} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
If a land is tapped for mana, it produces colorless mana instead of any other type.
This effect changes the type of mana produced, but not the amount. For example, if a land that’s tapped for mana would add {W}{W} to its controller’s mana pool, it adds {C}{C} to that player’s mana pool instead.
