It's possible Lutri, the Spellchaser would have ended up fine in Commander as it's ability isn't particularly game-breaking, but the format is known for its identity as a varied experience and having a card be ubiquitous and free for players to throw into their list was probably the deal breaker
Berta, Wise Extrapolator Clement, the Worrywort Dreamdew Entrancer Galloping Lizrog Genghis Frog Grolnok, the Omnivore Lilysplash Mentor Octomancer Omnibian Plaxcaster Frogling Pond Prophet Punk Frogs Species Gorger
It flips into a creature that's way above rate for its morph cost, with a pseudo-lifelink ability no less
It features a Collector Booster, 8 Set Boosters, 20 foil basic lands, 20 non-foil basic lands, 4 traditional foil alt-art cards, a storage box, an oversized Spindown life counter, and 2 reference cards
Generally you want to go wide to reduce the consequences of a spot removal spell, and so you want to make your whole team bigger , but sometimes you may want to go all-in on one creature if they have burn removal spells and/or one big creature you need to get through
Not to mention if you have multiple in hand