Anachronism

From BoardGameGeek:

A non-random collectible combat game presented by The History Channel and TriKing Games, Anachronism allows you to take control of some of the greatest warriors in history and pit them against each other in a one-on-one battle to the death. Anachronism began with a 2-player starter set pitting Japanese warrior Musashi against the Norse legend Beowulf. The game now includes cards featuring such notables as Julius Caesar, Sun Tzu, Spartacus, Alexander the Great, Blackbeard and Genghis Khan, as well as weapons and armor from various eras. Decks can be added-to with various booster packs, each of which include a set selection of cards initially focusing on Greek, Japanese, Norse, and Roman heroes, with other periods of history, including the eras of Genghis Khan and Richard the Lionheart,now in the mix. And of course, historical accuracy within the cards is sure to be high, as the game does bear the seal of approval from The History Channel. Variant formats exist for more than 2 players, and some cards in the game are geared toward multi-player games.