Elf (drow); earthwalker. If not involved in battle at the end of this player's turn. Uldo may send all cards attached to a dragon champion to the bottom of that player's draw pile. He must attack his next turn or be discarded.
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TSR
Wizards of the Coast
If Uldo has not been involved in battle during your turn you may activate his power in phase 5. The next turn after you have activated Uldo's power you must attack with him or he is discarded in phase 5. If some action of your opponent causes Uldo to lose his chance to attack, such as having Fear (372/4th) cast on him, he would still be discarded.
Uldo's power can be devastating, but is so restricted that you will rarely get to use it. If you expect to face a deck loaded with dragon champions this card is a sure fire success, but in just about any tournament it falls short. When you do get to activate his power your first target might be the Dragon Font (20/AR-chase), thus depriving your opponent of the ability to pull cards from the bottom of his draw pile.