Yes, as a reasonably-costed lord, Immerwolf was already worth the price of admission for tribal decks, but now those decks are potentially operating under two distinct transformation rules
While there are guidelines to keep in mind when deck building (no Game Changers in Exhibition or Core, no mass land denial through Upgraded, etc.), the bracket system is emphatically not just "put your deck into a calculator, get assigned a rank, and be ready to play." I deeply appreciate the tools that websites like Moxfield and Archidekt have put together to give you an overall estimate, and they've done some fantastic iteration to help emphasize intent as wellbut I want to stress that any estimate is just an estimate
FAKE There are also significant differences in the lighting test here
See copying artifact tokens here
That one relies on equipment, and your white cards that dont use that should be in a life gain deck
If this card is worth anything, it will be from the competitive scene