In the vast majority of games, the life that your opponent gains from you nuking their creatures with Swords to Plowshares will not amount to much, unless theyre playing a black deck with life-to-resource cards (watch out for Toxic Deluge or worse, Yawgmoths Bargain !) Swords to Plowshares isnt a particularly expensive card, and its very easy to find
As long as your playgroup is okay with these funky cards as part of your rule 0 conversation, you can always play them in your Commander pod or in your favorite Cube
The other issue with Seer is diminishing returns on scry
I'm ranking this one right on the cusp of the release of Ursula's Return, so it's difficult to make predictions around the price and popularity of the cards here
Yes, the Japanese Mythical Archive variants are available in set boosters, but only from Japanese language boosters
Perfect for drafting and casual play, it fits alongside other reprint sets like Dominaria Remastered