Best moment for me literally just happened. I built a taunt-heavy control deck with no "real" wincon except exhausting my opponent's plays. I end up against another priest who's clearly playing a similar game with gurubashi berserker as a wincon. He's running a little differently and has ressurect (I don't); we play out and he ends up with THREE northshire clerics at one point. I've got the justicar that lets me run 4-point heals from my hero power as a battlecry, and his biggest creatures are PW:G'd so they're a 1/x and a -1/x respectively (sen'jin and lightspawn, but he burnt his pw:s and divine spirits on keeping his draw engine alive earlier). I realize the guy's at like, 2 cards left, so now all I have to do is survive until he fatigues out - which should be quick, since he has 3 clerics on the board. I keep tossing taunts, he's basically playing on autopilot until he hits like 4 fatigue damage at which point he realizes he needs to quit healing his minions... but it's too late, he's at like 15 health. He manages to toss one of his clerics but I heal a creature of his next turn to do 13 damage and he draws into the fatigue death at the start of his turn with an 8 fatigue card.
EDIT: the long version
omg
so I built a... IDK what to call it
"taunt priest" deck
my goal basically was to just chip away at the opponent, using lots high health taunt minions and northshire cleric to prevent massive tempo gains from my opponent
just played another priest who has what i'll call a "standard" priest deck - lightspawn, divine spirits, etc etc
he ends up busting all my creatures as I drop them after a couple decent tempo swings in his favor, but he doesn't actually have a lot of damage on the board and I'm able to basically keep throwing down taunt
in the meantime, he's used resurrect and has ended up with THREE northshire clerics on the board, and is just busting through his deck.
I realize at 6 cards left in his deck that I have a shot to fatigue him out
I drop PW:G on his two big damage dealers (sen'jin and lightspawn), and he burned his pw:S and divine spirits on keeping northshire clerics alive, so he can't make lightspawn big enough to mean anything
meanwhile, he's still healing his minions. he pops a holy nova or whatever and goes like 3 deep into fatigue
I put down a taunt minion, he realizes he's pooched on fatigue and needs to come up with a solution so he tries to kill off his clerics but my minion's too low attack to kill more than one of them
we're now a 4 fatigue damage, mind you
(I'm at like 15 cards left in deck)
I drop a sludge belcher for lulz and throw a heal on one of his still-damaged clerics, hitting him for fatigue 5 and 6
no wait
he must've hit fatigue 5 that turn
because I hit him for 6/7
he draws into fatigue 8 with 2 life left
gg