Hex is a Shaman class Spell card. Its effect is to Transform a minion into a 0/1 Frog and it forces enemy minions, or the enemy hero to attack this minion. If there are multiple minions with taunt you can only attack those with taunt.
Hex is one of the best hard removal spells in the game which has earned it a place in every shaman deck. While it's not wrong to Hex minions such as Chillwind Yeti, it is better to cast Hex on a higher value minion such as Cairne Bloodhoof, Ysera, or other hard to deal with legendary minions. When playing with Hex, you should know about your opponent's scariest minions. Some decks -- such as aggressive charge decks -- have their biggest minion as Argent Commander so it is viable to Hex that as you will not get a better target.
|Gadgetzan Auctioneer||Rare||Neutral||Minion||General||6||4||4||Whenever you cast a spell, draw a card.|