Just now, playing against Morte. I've got 10 Unstable Gasses, a huge supply of Phase Shields, and plenty of Purifies. Rather than going for the win, I figure I'll wait it out and see if I can get Elemental Master, too. I keep stalling and stalling and my HP keeps creeping up until I've got 0 cards left. 97 HP, which isn't enough for Elemental Master, but which will earn me more than the 43 I had when I initially could have won, so I'm happy.
Then, instead of triggering one of the Unstable Gasses, I accidentally trigger one of my Electrum Hourglasses and commit seppuku.
I'm a genius.