Oh my lord... I just looked at a cardlist on Wizards... I'd forgotten all the good cards in Weatherlight...
Thundermare was always fun... (but not for me, I never owned more than 1)
Null Rod was good, but not that fun...
Fire Whip was good and fun...
But, the card I really liked for my zombie deck is -
Bone Dancer. So, that's my nomination...