Ok, this seems like silly question but I wanted to double check. Lets say I'm using Charizard d and I have 2 metal energy attached and a dre. Do I have to discard it when it's providing lightning and colorless for the attack? I'm almost 100% sure I have to since it provides every energy at once, but my friends were questioning it when i played against them last week. So i just wanted to double check...
