As you can tell from the Twitter post (assuming that you can read Japanese), this is meant as an incentive for Japanese audiences, so no point chasing after these in your English Collector Booster boxes
Kitchen Finks Finks is cheap, available to many decks, gives life immediately, acts as a good defensive chump and is hard to clear out the way
Additionally, all of the Kaladesh test prints have the same artist, "Mollusca Bivalvia", which is neither the artist for the actual card art, nor even a person that actually exists
On top of that, it can be broken with certain cards that also phase out permanents
Green Stompy decks are most common in Standard, where formats tend to be slower and fairer
Magic: The Gathering 's Spider-Man set will be released in just over three weeks now, and with most cards still being unannounced at the moment, there is a good chance that it will have an impact on the meta in various formats