I have two both revolving around the same action. The first happened a few months ago four player pod I'm playing my janky rats deck my friend is playing my equally janky Darreti another player is playing Krenko and the scary person at the table is playing a tuned Kruphix deck. So we're all staring down the Kruphix player with no hope in sight and I draw a card that let's me exile something from an opponent's deck and cast it as long as it's exiled( sorry can't remember the name, it's a black card) and I target Darreti getting [[mindslaver]]. I then target Kruphix with mindslaver I manage to kill the other two players with a combination of [[Genesis Wave]] and [[Craterhoof behemoth]] then mill him out with [[deadeye navigator]] and [[Primespeaker Zeganna]]. I still consider that my best win to date. More recently some friends and I were trying out the new commander decks and a new player to the store sits down with a tuned Azusa deck. Well we start playing and by turn five the Azusa player is really out of hand so another player casts [[cruel entertainment]] naming me and the Azusa player, well he of course draws a bunch of cards, sacks all my creatures, taps all my lands, and discards my hand down to garbage and passes the turn. Well this is were I go to work I couldn't tell you everything thing involved but I managed to draw his entire deck and was in the process of removing every nonland card from the game when he scooped but I made my point.

TL;DR killing someone with their own deck is the sweetest feeling in Magic.