I was at a pre-release tourney for D&P Legends Awakened I believe, and I pulled a Mewtwo Lv. X from the packs they gave me, and afterwards this kid came up to me and practically begged for it. At the time I knew that I wanted to collect the Gold Star cards, but didn't really have a sense of value for them, so when he offered me a Groudon Star, Kyogre Star, and the Azumarill box topper, I accepted. I now regret choosing Kyogre over Metagross, but hey, it was a great trade regardless
I traded a Groudon-EX FA for a Tornadus-EX reg, which I traded + a FA Victini FA for a FA Tornadus-EX, and I traded that +2 N and a Catcher for a FA Darkrai. I was pleased. Also traded 2 FA Darkrais for a Crystal Charizard, and the Darkrais are going to be tin promos...
At the last pre release I went to (Emerging Powers) the kid was like hey I want your encore whimsicott so I was like sure (I had no idea the value of it) and said hey can I have your manaphy (I didn't know it's value just that it was a decent card) and we traded, when I got back home I realized I ripped the kid