Bubbling Muck
Price
Sorcery
Bubbling Muck
Mana
{B}
Oracle text
Until end of turn, whenever a player taps a Swamp for mana, that player adds an additional {B}.
CommanderModernPioneerStandardLegacyVintagePauper
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Official rulings (2) · Scryfall
2004-10-04
Affects lands with type Swamp, not lands that are named “Swamp.”
2004-10-04
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.