Jaws of Defeat
From Tarkir: Dragonstorm Commander set
Jaws of Defeat
Enchantment
Whenever a creature you control enters, target opponent loses life equal to the difference between that creature's power and its toughness.
Rulings
- To 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.