Sonic Rainboom

As an additional cost to cast Sonic Rainboom,
tap an untapped Pegasus you control.

Sonic Rainboom deals damage to each nonpony creature equal to the tapped creatures power,
this damage cannot be prevented or redirected.

“Most people thought that the Sonic Rainboom was just an old mare’s tail. But that day… The day I discovered racing… I proved the legends were true!”
—Ranbow Dash