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Not the most powerful or well supported of Magics creature types, but theres lots of individual bears that can fit your needs in other deck themes
For those who want to see all the leaks, which include multiple versions of all main Turtles, new classes, and a majority of baddies from TMNT lore, check them out below with a massive spoiler warning
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Its ability looks pretty insignificant at first but combined with certain cards, it can help you produce infinite mana, buff your creatures with a gazillion counters and draw at the same time, or even have infinite turns
There are also concerns over the cards being essentially pay-to-win mechanics, as you're guaranteed to get them in a purchase, and they each have some pretty devastating card abilities