This is a common that could make an impact in Pauper, and I’m not sure why it hasn’t. Two mana for +4/+4 at instant speed isn’t bad, but the trample is huge. Pauper Infect can be a thing, after all. There’s also Mono-Green Stompy, one of the oldest deck archetypes in Magic. You don’t have access to the premier pump spells like Blossoming Defense, Might of Old Krosa, and Mutagenic Growth in Pauper.
Larger Than Life is a decent pump spell that had a spike in interest. While it hasn’t shown up in any other top lists besides those mentioned, it certainly could pop up in some future Pauper lists in addition to things like Rancor, Hunger of the Howlpack, and Vines of Vastwood. Whether it will ever be more than a one or two of in lists like those, though, remains to be seen.