I've been farming in the Silver Arena for a while and came across this following situation twice. I would challenge a deck that had no name at all. It's level and rank were NaN, it's HP was NaN, it's wins and losses were NaN. It's age was some insanely high decimal value that didn't completely fit in the text field it was put in. The deck had max stats in every category. If anyone is curious, it's Oracle card was an Antlion it both cases - the same Oracle card I got today.
Yet when I challenged it, I won immediately before the coin was even flipped to determine who went first, thus giving me an EM and a free 84 Electrum. The slots spun and every spin gave me a blank background. Yet in the end, I won a single Relic despite it never appearing in the slots.
What's up with this?