Halfling. The attached champion may use thief skills. He may also use one magical item from any pool for this round of combat.
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TSR
Wizards of the Coast
The special power of this ally makes it a good one to have in a deck that has lots of thief skills in it.
It has the main benefit of allowing a champion who normally couldn't use thief skills, to use them and at the same time, also borrowing a potentially powerful magic item for use in the battle.
You can borrow a magic item from any pool, including your own. The borrowed item is returned to its owner after combat is over, regardless of whether you win or lose.
It is important to note that the ally is not the one using the thief skills, the champion is. Therefore, if the opposing player plays a counter card like the event Busted! (3/NS-chase), it affects the champion and not the ally.
A good item to use is the Staff of Conjuring (105/3rd). This allows you to bring this ally back over and over again.