Worst trades you've made

I've traded a number of things over the years for almost nothing. I traded Mox Opals for next to nothing, because I didn't (and still don't really) think it was a great card and that it would be playable.

I've mostly been savvy though, I can't really think of anything that I've completely been beaten up with losing.

I traded  Akroma, Angel of Wrath foil for some yugioh cards several years back.

The night of the gate crash pre-release I traded a  Boros Reckoner and a  Boros Charm for a  Watery Grave. I goofed 😲😲😲

I can't find my Chain Lightnings from the Fire & Lightning Premium Decks. Really sad now, must have traded them when I was a noob.

Traded a  Jace, the Mind Sculptor for  Emrakul, the Aeons Torn when it first came out. Even trade then, still have the emrakul and now a play set of jaces. Bad trade, but I'm not hurt too much over it.