Ritual of Subdual - Ice Age (ICE)
Enchantment
Cumulative upkeep (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.
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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}, it adds {C}{C} instead.
October 01, 2008