ok... this is really easy to do, you should be able to do it
http://svn.rathena.org/svn/rathena/trunk/doc/item_bonus.txt
well huh i will help you this time just make sure to read those
here
20597,Champion_Card,Champion Card,6,20,,10,,,,,,,,64,,,,,{ bonus5 bAutoSpellWhenHit,"MO_EXPLOSIONSPIRITS",1,100,BF_WEAPON|BF_MAGIC,0; skill "MO_BODYRELOCATION",1; },{},{}
20598,Creator_Card,Creator Card,6,20,,10,,,,,,,,16,,,,,{ skill "CR_FULLPROTECTION",5; bonus bBreakArmorRate,500; bonus bBreakShieldRate,500; /*iraqi strike?*/ if( Class==Job_Creator ) bonus bAspdRate,-5; bonus2 bSkillAtk,"CR_ACIDDEMONSTRATION",50; },{},{}
20599,Gunslinger_Card,Gunslinger Card,6,20,,10,,,,,,,,2,,,,,{ bonus3 bAutoSpell,"GS_RAPIDSHOWER",10,50; bonus2 bSkillAtk,"GS_DESPERADO",25; },{},{}
20600,Ninja_Card,Ninja Card,6,20,,10,,,,,,,,64,,,,,{ skill "NJ_TATAMIGAESHI",1; bonus3 bAutoSpell,"NJ_SUITON",3,50; bonus3 bAutoSpell,"NJ_UTSUSEMI",3,10; bonus2 bSkillAtk,"NJ_ISSEN",25; },{},{}
20601,Paladin_Card,Paladin Card,6,20,,10,,,,,,,,136,,,,,{ skill "CR_FULLPROTECTION",5; bonus5 bAutoSpellWhenHit,"CR_AUTOGUARD",10,100,BF_WEAPON|BF_MAGIC,0; bonus5 bAutoSpellWhenHit,"CR_REFLECTSHIELD",10,100,BF_WEAPON|BF_MAGIC,0; bonus bMaxHpRate,10; },{},{}
20602,Professor_Card,Professor Card,6,20,,10,,,,,,,,769,,,,,{ bonus3 bAutoSpell,"SA_DISPELL",1,10; bonus5 bAutoSpellWhenHit,"SA_LANDPROTECTOR",3,50,BF_MAGIC,0; bonus3 bAutoSpell,"PF_FOGWALL",1,30; skill "SA_FREECAST",1; },{},{}
20603,Stalker_Card,Stalker Card,6,20,,10,,,,,,,,769,,,,,{ skill "RG_CLOSECONFINE",1; skill "ST_CHASEWALK",1; },{},{}
20604,Star_Gladiator_Card,Star Gladiator Card,6,20,,10,,,,,,,,769,,,,,{ bonus bAllStats,5; bonus bFlee,15; bonus bFlee2,10; if( Class==Job_Star_Gladiator ) bonus2 bAddRace,RC_DemiHuman,50; bonus bMaxHpRate,10; },{},{} //if you are using last revision change RC_DemiHuman for RC_Player
remember always to read the wiki
http://rathena.org/wiki/Main_Page
also the documentation for more references
http://svn.rathena.org/svn/rathena/trunk/doc/