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Aside from growing whenever another human enters the battlefield under your control, it also grows your other humans when it enters the battlefield

Thunderous Velocipede After you land Thunderous Velocipede, even if you dont care about vehicles at all, each creature you cast after this gets +1/+1 counters, so its a very strong card in a counters plus proliferate strategy

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Flying Kamikari and Howling Insect search for Ultimate Insect LV3 at the end of the opponent's combat

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The combo uses lots of cards that can get the cycle started, either by putting exactly one counter on a permanent or by making the opponent lose 1 life