Attack: Fire Stream
Energy Cost: Fire, Colorless, Colorless
Attack Effect: Discard a energy card attached to Blaziken. If you do, this attack does 10 damage to each of your opponent's Benched Pokemon. (Don't apply Weakness and Resistance for Benched Pokemon.)
Im forced to discard a fire energy because it says "Discard a
energy card attached to Blaziken."
But then it says "If you do". Im just wondering, are you forced to discard a fire energy when you use this attack? Or is it optional because the "If you do" throws me off. Let me know. Thanks, really appreciate it.