I had a great arena run today (9 wins) where I was showing one of my friends how to play arena, and while i was debating whether to use a Keeper of Uldaman on his Fen Creeper, or buff a minion with Seal of Champions, when I accidentally cast the Seal on the Fen Creeper. Needless to say, I started freaking out, since my board was only a 2/2 and a 3/3, and I was sure I was going to lose. It ended up being the longest game in the whole run, almost going down to fatigue. I did manage to win the game, which ended up being a really good lesson for my friend on how no game is impossible to win, and why not to get cocky and take unnecessary risks even when you're ahead.
In short: Winning after making a horrible mistake.
2nd: crushing anything with freezemage, while they cant do shit about it.
1st: a really long battle into fatigue in an unfavoured matchup that u still manage to win, especially when u seemed to lose a long time, have horrible rng and still win. #outskilled him (for example: cw against control priest, he shrink cabals my ysera, i brawl, ysera survives, no executes, no shieldslam at that time, he also had mindcontrol, but deep into the fatigue i managed to kill him, he had loatheb on board about 7/8 turns during the fatiuge, still won when he was at 21 hp, deathsbite charge into grom into 7 fatigue damage)
Mine is beating players who, based on the apparent dust costs of their decks, clearly have been playing for way longer and/or spent far more money on the game than I have. I was recently playing my Oil Rogue deck (less than 2,500 dust cost) against a Secret Paladin deck who clearly thought he was going to win, from turn 1. Emoting so much that I had to squelch him, pulling legendary after epic after legendary (Quartermaster, Lay on Hands, and finally, of course, Mysterious Challenger, among others), and managed to turn it around and, with me at 3 health and him at 18, use the Deadly Poison and two Sharpsword Oils in my hand to beat him. I unsquelched him just before I did, and he just threatened, haha.
Previous turn Kel'thuzad and reincarnate, this turn ancestral Spirit and my second reincarnate, so 4 KTs plus whoever else I had on board and my opponent concedes as overlapping voices of multiple KTs echo from my phone. So cool.
Also, getting lethal with Baine Bloodhoof, his 'ishnayonay parai' or whatever he yells is beyond cool.
Play some gimmick deck and win using that. One time only when i used mage deck with all spell and manage to won the game with it. Simple stuff i manage to copy his big stuff and duplicate it. Fun moments