what champs should i buy

i got olaf a couple of times in aram and i kinda think hes good , but i dont know if i actually should buy him since i would have to trade some tokens for blue essence , hes the only 3150 champ i would maybe buy , but if i save up some more blue essence i could also get syndra , trundle or vayne between trundle and olaf , who is stronger for jungle or top lane , i kinda lack top laners right now
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