Elige dos criaturas que controlas. Robas X cartas y las criaturas elegidas obtienen +X/+X y ganan la habilidad de arrollar hasta el final del turno, donde X es la diferencia entre las fuerzas de esas criaturas.
If you don't control two creatures as Spry and Mighty resolves, the spell won't do anything.
To find the difference between the power of the chosen creatures, subtract the smaller of those two numbers from the larger one. For example, the difference between the power of a 3/3 creature and a 5/3 creature is 2.