what champ should I add to my champ pool?

playing jng, looking for a 3-4 champ pool to pick for the right match up! Yi = if enemy has no form of cc Amumu = if my team has 2+ AP so what should I add? champs that look interesting... Karth.. Rengar... Trundle... Kindred... Lee sin... Nunu... what champ? when should I play it?
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