Nyorai kupfuurira kweiyi ndima - Kozma akasarudzwa kuTriple-A kutanga mwaka wa2012. Akadanwa kuKardinal musi waAugust 31, 2012, apo Rafael Furcal akaiswa pane vakaremara. Kozma akarova kuti ape maCardinals makundano anogadzirisa mumutambo wechishanu we2012 National League Division Series (NLDS) pamusoro peWashington Nationals. Munguva yeNLDS, akarova home run - yake yekutanga muMLB postseason - uye akaendesa mumhanyi vashanu. Kozma akarova.227 panguva yeNLCS
vachipesana neSan Francisco Giants ndokuwedzera hwaro hwakabiwa. Pasinei nokuwana 3-mitambo-kune-1 mikana mumutambo, maKardinal akarasikirwa neChirongwa cheChishanu mumutambo wechinomwe uye unosarudza.