Bubbling Muck #54
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Card Details
Until end of turn, whenever a player taps a Swamp for mana, that player adds an additional 
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“The muck claims a hundred living things for each meager treasure it spews forth.”
Illustrated by Greg Hildebrandt & Tim Hildebrandt
Rulings (2)
Oct 4, 2004
Affects lands tapped for rest of turn, not just swamps on the battlefield at the time it resolves. This is because it affects players and not the lands themselves.
Oct 4, 2004
Affects lands with type Swamp, not lands that are named "Swamp."