Jaws of Defeat
Enchantment
Oracle Text
Whenever a creature you control enters, target opponent loses life equal to the difference between that creature's power and its toughness.Rulings (1)
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Wizards of the CoastTo find the difference between a creature’s power and its toughness, subtract the smaller of those two numbers from the larger one. For example, the difference between the power and toughness of a 3/5 creature is 2. The difference between the power and toughness of a 5/3 creature is also 2.