Shaman en-Kor

Its mainly good in its respective, Infinate Mana deck.. other than that, I've seen it used to decent effect in old shadow based decks. Even without using it in an infinate mana combo deck, it still can be pared in a Tribal deck with Daru Spiritualist for two creatures that can together take on any size creature.

I find that card is most useful in an all cleric deck, or against those pesky dinkers that seem to take out all your usefull 1/1 creatures. Its potential is completed with a few battle feild medics which seem to crate an almost impervious defence in the right situations.