It is a character class in Dungeon & Dragons
A swordmage should typically either have a one-handed sword in each hand or a one-handed sword and a wand of accuracy in the other.
This is a list of all the cards that he used throughout the series, although it is most likely that whenever it was necessary that writers would write in a new card so there are probably many more.List A-ZAlpha The Magnet Warrior Arcana Knight JokerArchfiend of GilferBerfometBeta The Magnet WarriorBlack Luster Soldier-EoBBrain ControlBreaker The Magical WarriorBuster BladerCard of SanctityChain DestructionChaos Command MagicianChimera, The Flying Mythical BeastDark Flare KnightDark HoleDark illusionDark Magic CurtainDark MagicianDark Magician GirlDark Magician KnightDark PaladinDark SageDe-FusionDes VolstgalphDiffusion-Wave MotionDouble SpellDust TornadoExodia (5 cards)Eye of TruthFiend's Sanctuary (Battle City)Gamma The Magnet WarriorGazelle, King of Mythical BeastsGold SarcophagusGreen GadgetHorn of HeavenJack's KnightKing's KnightKuribohLight of InterventionLightforce SwordMage PowerMagic CylinderMagic FormulaMagic JammerMagical DimensionMagical HatsMagician of Black ChaosMagician's ValkyriaMaster of Dragon KnightMeteorainMirage KnightMirror ForceMonster RebornMultiplyMystic BoxMystic SwordsmanObnoxious Celtic GuardPolymerizationPremature BurialQueen's KnightRed GadgetRoyal Straight SlasherSage's StoneSanganSilent MagicianSilent SwordsmanSkilled Dark MagicianSorcerer of Dark MagicSoul Taker???Spellbinding CircleStronghold The Moving FortressSwift Gaia The Fierce KnightSwords of Revealing LightThe Shallow GraveTime SealTribute to The DoomedValkyrion The Magna WarriorWataponYellow Gadget