Hex it is, then.

Pick #3
Frost Elemental/Dalaran Mage/Darkscale Healer

Spoiler: Mana Curve
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Spoiler: Previous Picks
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1: Wailing Soul/Sunfury Protector/Alarm-o-Bot
2: Gnomeregan Infantry/Hex/Razorfen Hunter
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Quote Originally Posted by GAAD View Post
Hex. Better than Polymorph in my opinion since if desperate you can use it on you own guys.
Some "find the lethal" challenges take advantage of the fact that you can turn your own guys into sheep, too.