What are some mistakes you've made in your decks that you didn't notice until you started playing it? This week I played a tourney in my area. I was playing a Kingdra EX (Fates Collide) deck and got to the finals, only to then have it pointed out by my opponent that I was not able to count Double Dragon toward the bonus damage on Dragon Trail. I had glanced over the text that mentions it must be BASIC electric energy to get the +30 damage and no one questioned my plays until the very end of the tourney. It was extremely embarrassing as I played the deck for almost a month assuming I could stack Double Dragon for more damage. Thankfully I was not disqualified since the event was fairly casual, but it really sucks that my deck didn't function how I expected it to!