Animal Sanctuary is a very unusual land for Core Set 2021. But lands like this usually become very popular in format like commander.
There are already three tribes well-supported in the format by this land: bird, cat, and snake. Also, there is a possibility that dogs will become a thing sooner rather than later, bumping that to four
Lastly, Animal Sanctuary fits perfectly with changeling decks, where they will surely benefit from its pump ability.