chicken is indeed one of the most robust character ever created. 0 mana is indeed the selling point. However if you have upgraded it to some high levels it may create some problems for example during no melle ruleset you cannot use chiken as neutral item and it may be the reason you lose the game lol. Its particularly strong when it has got armor as well from either ruleset or life splinter. but overall its a very very strong card and the price should increase in future