Inferno X (MUR Charizard X ex, +28% from launch) and MEGA Dream ex (post-reprint opportunity) fit this profile closest
We almost never want to play it in the first few turns (we have dorks for that), but in the later game we can start other creatures on the growth package, we can proliferate the crew to make our creatures and planeswalkers bigger, and there are corner cases where it's proper to put the Druid's counter on one of our evolve creatures
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Throughout the game players will have to make skill checks
Plus, as I mentioned, many of the top decks in Standard are skimping on removal, and when Emeria Shepherd sits on the battlefield for a few turns, the amount of value it generates is almost always game winning