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Rulings
An ability that triggers “whenever you tap a creature for mana” triggers only if you activate a mana ability of a creature including in its cost. Mana abilities that don’t include the symbol and instead say “Tap an untapped creature you control” or similar won’t cause Leyline of Abundance’s second ability to trigger. Similarly, it won’t trigger if you tap a creature to activate a mana ability of another object (even if that mana ability also includes ).
Rulings
An ability that triggers “whenever you tap a creature for mana” triggers only if you activate a mana ability of a creature including in its cost. Mana abilities that don’t include the symbol and instead say “Tap an untapped creature you control” or similar won’t cause Leyline of Abundance’s second ability to trigger. Similarly, it won’t trigger if you tap a creature to activate a mana ability of another object (even if that mana ability also includes ).
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