Crit Poppy is Best Poppy
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http://efferentinc.com/wp-content/lol6calc/index.html#K0CvyKxCvCvKY
AD runes/marks, armor seals, scaling mr glyphs
You have 0 mana problems, 3.5k health, and you can assassinate folks like crazy. They cannot escape the E-W combo dive. Instead of IE, you can go phantom dancer to be more tanky and inescapable.