It just happened again. This time I had a druidic staff on the field as an adrenalined flying weapon (great combo). I made sure to heal with my heal, then took them out. Won and got 20 electrum, but no EM. I think it might be something with the way they re-coded it. I think the fact that my staff "healed" me counted against me, since it delivered the finishing blow, even though I already had full health because of the heal card I used.
@qazzaq123, nope. I'm using a Rustler/Emerald Dragon/Heal deck, and I had full HP at the end because of heals. No antimattered vampires on my team or anything like that, haha. And I didn't use shard or stone skin. I got 20 electrum at the end. I would have chalked this up to "I didn't see that I was low on health" or something, except it's happened 3 or 4 times.
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Go into the character screen and click on one of them. You will then start every battle in that style.