yea the only thing i agree with endless with so far.. karthas is amazing, ask any EU player how a karthas tower dive works.. ask how its possible for karthas to clean up any kills using his ulti when a teammate calls for help
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For karthus not being top tier he sure gets played a lot in tournaments. Plus if you just started he is a pub stomper for sure. If you are just starting play everything quite a bit, it will help you understand the mechanics and abilities of each better, and there is a decent chance the metagame and therefore tier 1 lists of pros will change by time you actually hit 30 and level your elo.