#1 Patches the Pirate - It's not necessarily the card itself, it's everything that it represents: Pirate Warrior. Token Druid. Quest/Tempo Rogue. So many annoying aggro/snow-bally decks. You see him, you basically know how the game will go. Hell, I hate playing those types of decks and yet I finally ended up crafting him for a priest deck. He's everywhere. He's been in every tier 1 deck until just recently.
#2 Mysterious Challenger - Such a stupid deck around this one card that only a couple of classes had any chance of combating. If you didn't have full board control by turn 6 against one of the most tempo-oriented classes in Hearthstone, you were pretty much dead. How this escaped the nerf bat, I don't know. Just not #1 since I laugh now every time I see someone trying to play this deck, but at its peak, it probably was worse than Patches in Pirate Warrior after MSG.
#3 Coldlight Oracle - Listen, I respect mill decks. It's a cool idea, they take skill. But damn, are they annoying, and they are entirely fueled by this one card. Any mill game (since I generally play warlock or priest) is just complete un-fun.
Coldlight Oracle and it's not even close.... Everytime I see someone playing the card I just concede on spot cause I know I'd get awfully pissed if I kept playing.... Seriously,Mill isn't a strategy! Get a real wincondition instead of burning mine....
Lol. It requires a lot of skill to pilot, and one misplay costs you the game. Nothing more satisfying than burning a Highlanders win condition.
Blizzard should make a special stream lessons or youtube videos in which they explain the the only way hs should be played is with supa dupa 1000 IQ control/combo homebrewed decks and 30 minutes long match is a minimum time period that proves you're not braindead blah blah something etc.