The obvious use case is in Lathril, Blade of Elves, as youll be able to attack, get your elf tokens, and then be able to hold up her tap ability from the beginning of the next combat
This lets you recur your creatures quite efficiently, especially if you can find a way to protect them
I wont get into the rules minutia here, so just know that planeswalkers are manifestations of popular Magic characters in card form, meant to aid you in your quest to do whatever it is youre doing in-game
Innistrad: Midnight Hunt (2021) brings three new cards, but only the rare (Florian) did anything in constructed and not even much there
Minerva, the Exalted Lightsworn (YCSW-EN008) Estimated Value: ~$25,000 to $50,000 (the Ultra Rare prize version) Why It's Valuable: A Yu-Gi-Oh