Karthus vs JarvanIV — laning phase
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Aggregated laning stats unlock at 8 Diamond+ games for a matchup - 4 games so far. Meanwhile, watch them:

WKarhus9/4/13MasterWKarhus16/7/8MasterLderajgg9/9/6DiamondLAnoyingTV1/7/2Master
all Karthus vs JarvanIV on the champion page