Artemis can use unarmed combat cards usable by heroes, and he gains 5 levels if the opposing champion plays no allies.
Copyrights:
TSR
Wizards of the Coast
Artemis can use any unarmed combat cards that are usable by heroes. If the unarmed combat card does not state what type of champion may use it, then it is usable by heroes. Artemis also gains a +5 to his adjusted level in combat (only) so long as the opposing champion has no allies attached. Once the opposing champion plays an ally the +5 is lost for the remainder of the combat, even if the ally played is some how removed.
This champion's powers are very strait forward and work well in any thief or combat deck. Artemis is also a good choice for a Forgotten Realms world deck if you wish to use thief skills. A good combo for Artemis is the magical item Net of Entrapment (217/3rd) to help him keep his +5 in combat.
In the over all picture of things Artemis is too weak to get into most decks. But with the low number of thieves in general and Forgotten Realms thieves in particular you may bump into this champion in a world war tournament.