Was thinking about getting Rengar

If at all possible don't use RP to purchase champions. If it turns out you don't like the champion, you'll regret it more.

https://i.imgur.com/1HvNiEO.png?noredirect

Never buy champions with RP.

Build crit chance to burst quickly. If you wanna do 1 shots then build . Or you can opt out of the boots and get something like if its late game and you have the gold. Try to use E on target before leaping, Q before you attack so its ready, and W while you are in middle of animation. Best to do that combo during ult while you have 5 stacks and on a squishy. E before leap, Q ready using empowered version, W in air.

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Was thinking about getting Rengar

sry to hear that