Executioners call offers a bit... too much?

I know ad based champs need a healing cut counter part... But, really? This thing is active on the first hit.. Why not? Mundo can't counter act that thing. Once you start a fight with your top laner.. It immediately puts you at a disadvantage. It's not even like he can itemize around that. That item, for 800g completely trashes an entire champion. If it were like Morrello's starting at a hp threshold that would at least be more consistent. But this item is brutally over powered in the right situations and the cost efficiency is god tier. Am I missing something here?
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