I was using Chaos Lightlord facing off the shopkeeper's Arcana deck in WC2011. I did not get out any boss monsters and my hand and field was getting wiped out and I had a lumina left with Arkus, card trooper and Tragoedia in hand. She got 3 Arcana monsters on the field and use them to summon the Arcana boss monster, level 10 with 4000 attack.
She attacked with it and destroyed my lumina and I summoned Tragoedia. Next turn, I draw my other Tragoedia... :D
I wanted to save the replay but was too used to skipping the replay save option that I missed it!