Protection is a bit heavy-handed for this purpose, though
We've seen some other semi-popular Kamigawa cards like Oboro, Palace in the Clouds and Minamo, School at Water's Edge maintain huge prices despite fairly low play, which means if Shining Shoal does develop into an archetype staple in Modern, its price could climb even higher
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A final turn to upgrade that Thopter into a 4/4 Construct is just gravy
As of 2021, there have been two such cards with a third still planned: 2018 winner Jose Dominguez as Fervent Champion, 2019 winner Paulo Vitor Damo da Rosa as Elite Spellbinder, as well as the winner of the 2021 championship also getting a card
Some fogs prevent damage to planeswalkers, it just depends on the wording of the effect