Youll put a counter on the creature, and if it dies, you get to return it to the battlefield, usually getting more benefits when they enter
Which brings us to our next explanation
Study Break 2 The Expose Evil of learn cards
Its a format that has plenty of artifacts, and artifact decks can quickly go wide with all kinds of mana rocks and small permanents
Response / Resurgence Response is a good rate for damage to a creature, but the big-time reason to play this card is Resurgence which is nearly Boros-speak for extra turn
MaRo himself has recognized at multiple occasions that Planeswalkers had some of the smallest design space of all the card types (except maybe lands?) Due to how inherently powerful their concept is, providing mana and card advantage, and the fact they all have multiple abilities, and so many other restrictions, it is no wonder that many designs converge towards somewhat similar end results