Ok some cards really are just overpowered. I happened to get one of them on my priest. It is the one that it's attack is the same as its health. If you don't kill that card the first round it is played, you are dead. I played the following on the next round:
+2 health + draw card (1 mana)
+2 health + draw card (1 mana)
Minion that give +1/1 (3 mana)
Double health (2 mana)
Result 20/20 powered minion. I had a Lord of the Arena out there which I used to kill their taunt, and smacked their hero for 20 damage. He then played another 2 taunts, which I countered with a charge and my other minions, and I played my other Double health card, giving that minion a 40/40... In two rounds the enemy hero went from full health to -30.
If you don't have an insta-kill or a transform (like sheep or frog) in your hand, you are simply dead (silence might work as well, but not a lot of people have silence in their decks).
Naw, I got hit with a 1-shot combo this weekend from a priest. He played a 5/5 stealth tiger on round 3. Alarm-bot with mana crystal and it pulled that out his hand. 2 x +2 health + draw cards for 1 mana each next round making it a 5/9 critter. Fourth round he clears the board of my minions. Next round was 2 of the double minion health at 2 mana a pop making it a 5/36 criter. Then cast inner fire making it a 36/36 critter on round 5.
I was killed round 5 with 30 health. It wasn't pretty as there was zero way for me to deal with that combo even with my mage. I can't polymorph it (which I had in hand), I couldn't directly blast it, and there was no way I was getting a big enough arcane blast, flamestrike, or blizzard out that soon to pop it.
All he has to do is make something that stupid that early with a stealth critter. Then clear the board of any taunters before smacking away with a 1 shot kill critter. I called my friend about it happening to him, and as I was talking he said he was having a cleric do basically the same thing to him at the exact same time.
Funny thing is a few hours later I did something almost as bad. Except with lightwells. I had to play my cleric for a daily. I popped two light wells out. I had +2's for both making them 0/7 crtters that health themselves for 3. Yah those are not easy to kill when they are dropped by round 5. Next round was double life for both and inner fire. Making 14/14 light wells that heal themselves. Seriously stupid to stop if you get the combo.
Then again I had the most stupid game with my cleric prior to that which I lost. I had my initial hand to select with two of those 2/7 gurubashi minions. I don't like having them in my opening hand as they are 5 mana, and require more to make effective. They are great mid/late hand cards though. So I selected to have them removed from my opening hand. Only to have the game deal them right back at me.
GRR.
So I get for my next two cards the "thought steal" cards? Which give you 2 cards from your opponents deck. First one gave me 2 gurubashi minions. Second thought steal gave me 2 more gurubashi minions. I literally had 6 of those guys in my hand and I was thinking what the odds of that actually happening like that. Serious was screwed up. I certainly lost.