As these items are usually made of a harder plastic and will be a fair bit wider than the card, its impractical for cards being used in a deck
This auction just so happens to be a great illustration: www.ebay.com/itm/Opened-Shadowless-Pokemon-2-Player-Starter-Set-Theme-Deck-FREE-SHIPPING-/234068524196?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l6249&mkrid=711-127632-2357-0 As for the shadowless base set machamp it can be found in both formats and I believe the shadowed version has both too
Our advice for protecting yourself is straightforward: Buy graded whenever possible
In Water Vanilla Aggro, Magic Reflector has potential as a protection for the many continuous spell cards played, including A Legendary Ocean, Heart of the Underdog, and Non-Spellcasting Area
If youre pitching cards anyway, this turns the downside into value fast, especially in decks like Hashaton, Scarab's Fist in Commander, where youre already discarding creatures for value