Royal Decree #31
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Card Details
Cumulative upkeep 
Whenever a Swamp, Mountain, black permanent, or red permanent becomes tapped, this enchantment deals 1 damage to that permanent's controller.
Illustrated by Pete Venters
Rulings (1)
Oct 1, 2008
Royal Decree's ability will trigger a maximum of once for each permanent that becomes tapped, even if that permanent meets multiple criteria. (For example, Badlands is both a Swamp and a Mountain.)
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