Parrley. Gives him extra gold for last-hitting, can crit extremely hard (I cannot tell you how frustrating it is to have 50 armor at the start of the game and still lose 200 hp to a parrley crit).
He can also heal and cleanse himself out of stuff.
And after he hits 6, he can afford to go back to buy items and still defend his turret.
He also meshes well when his jungler comes to help him gank, because of his passive.
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~AHylian is Still Alive~