Dwarf. In phase 0, this champion may either recover one magic item with the words 'oil' or 'potion' in the title from the discard pile, or take one such card from his deck, and play it immediately upon himself.
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TSR
Wizards of the Coast
This dwarf is set for a theme of potion and oil magic item cards. Besides the cards in this set, there is only one other potion: Potion of Fire Breathing (215/1st).
The Brewmaster, during phase 0 (so not on the turn he is played) can either search his deck for an oil or potion, or can pull back an oil or potion from the discard pile. Either way, the potion is attached to the Brewmaster. Good choices for the Brewmaster to search for include the Oil of Disenchantment (32/CH) and the Potion of ESP (36/CH) (both of which go to the Abyss after play), and the Potion of Super-Heroism (40/CH). Nectar (34/CH) and Ambrosia (35/CH) are not formally potions (though they are used the same way), so the Brewmaster may not get them.
Coupled with Tasslehoff Burrfoot (39/DL) and Pelath the Bronze Dragon (28/DR), this could make some awesomely dangerous magic item decks. The only cards that can do similar searching at Create Object (97/PO) (which puts the item into play) or Moraster (339/4th) (which puts the magic item on the top of the deck).
Since the Brewmaster has no immunities and a low level, nearly any method of champion destruction is effective against him.