Flip a coin. If heads, this attack does 10 damage plus 20 more damage.

This attack does 30 damage plus 20 damage times the number of your opponent's Benched Pokémon minus the number of your Benched Pokémon. (For example, if your opponent has 3 Benched Pokémon and you have 1, this attack will do 30 damage plus 40 more damage.)