Okay, here it is. I pretty much stopped collecting cards around the release of the game Pokémon Gold/Silver. I got some here and there, but that was about it. Now I've started collecting again, but my mind has totally slipped up as to the problem of energys. I understand that a deck should have energy cards prominent. Now, to my stupid question; If an attack has a colourless energy next to it, can you substitute colourless for another energy? Sorry if this seems ignorant. You're probably all thinking GTHO noob, but it's a serious question. My deck is 16 psychic and 4 normal, and every single card (give or take) requires that. Please be nice with answers to this, it's been a LONG time.