There are sidequests and minigames you can spend endless time on
Buffing your team with its ability can often time scale most of your creatures up past what is manageable
Getting this out early will open strategy opportunities that would otherwise be unavailable to you until later in the game, giving you a great head start
Teysa decks tend to revolve around token generation and lifegain to mitigate incoming damage, which can be effective pillows in your deck
Credit: Wizards of the Coast Zask, Skittering Swarmlord FromTheShire: Playing lands from your graveyard is a great effect, and there are a metric truckload of Insects these days, including some pretty good ones like Mazirek, Kraul Death Priest and Caustic Caterpillar that you're going to be real happy to cast over and over
Add to the fact that this card has vibrant cute artwork that was never released outside of Japan, and it is easy to see why it became a valuable chase card for all regions and collectors