In the rare case where a legendary creature becomes a copy of another legendary creature with greater mana value (for example, if Sakashima the Impostor is a copy of a legendary creature with mana value 5 or greater), then when that creature dies, if it's still a legendary creature card in your graveyard, Havi's last ability will be able to target it
Thankfully, Bloomburrows Peace Offering precon has a number of viable win cons across its decklist that are well worth exploring and are even furthered by some slight upgrades
Fun fact: Kyogres glowing markings intensify when it calls upon the primal forces of the ocean
Meanwhile, cards such as Kronk, Junior Chipmunk and Beast, Forbidding Recluse are able to dish out damage on top of their own strength, whittling away your rivals defences
Finizen
Im not seeing it taking the place of another card in another deck without the support of the reduction or upside of planeswalker much though