User blog comment:アゼム/【For any users】Guessing (buddy)game of the year (2014)!/@comment-5397676-20140506222716

Secret Sword, Breaking Wave

■ [Cast Cost] Pay 3 gauge.

■ When your opponent attacks you, and they have 2 or more monsters on the field, if this card is the soul of "Secret Sword, Lethal Formation", you may cast it. (You may not cast it from your hand.)

■ [Counter] Deal 3 damage to your opponent! Nullify that attack, and destroy all of your opponent's monsters on the field!

(Just in case you were unsure the wording makes it, so that they have to attack you directly)

Is the destroy all monsters on their field too much?