Luffy has the strength of being the protagonist, and is particularly easy to attract attention in the highest-tier specifications like Manga Rares
Sell your Not Dead After All Switch to Foil Customers who purchased Wilds of Eldraine : Not Dead After All also bought
Those are just a couple of the considerations, but Mark Rosewater has an excellent article on DailyMTG that goes really in depth about the design process for our Universes Beyond video game properties, specifically: There are a lot of video game franchises that are a bit more adjacent to the usual fantasy-style of Magic: The Gathering - what made Fallout such an attractive choice for an early start on these crossovers
Our squirrel friends are looking at every individual die roll, not the combined result of two dice
Combining this with a card like Bristly Bill, Spine Sower that puts +1/+1 counter on landfall is devastating
If we wanted to make a new one-of delve, phasing, or split second card, it was all still on the table