This might be thicker, thinner, a different color (gray core instead of black, for instance), a different texture, or even card stock intended for a different card game
So, there is my 2 cents on Steel
In older WOTC-era cards (Base Set through Skyridge), the set symbol appears on the right side of the card, between the artwork and the card description text
So sit back, tap some islands, and get ready for the best of the best in blue

Seattle, WA Seattle 2026 August 14th - 16th, 2026 000 Days 00 Hours 00 Minutes 00 Seconds Don't Miss Out Event Schedule Friday AUG 14 1:00 PMVendor Check-In & Set Up 3:30 PMVendor Hall Opens for VIP Badges Open for League & Gym Badge Holders 4:00 PMVendor Hall Opens for All Badges Kickoff Party & Voice Actor Alley Opens 5:00 PMCharacter Photo Ops 6:30 PMPokmon Bingo Panel Room 6:30 PMCharacter Photo Opps 7:00 PMCoop & Beard Dad Show TCTV Stage (45 min) 8:00 PMCharacter Photo Opps 8:00 PMCoop & Beard Dad VIP Meet & Greet Panel Room (45 min) 9:00 PMMagic Commander Free Play Panel Room 10:00 PMVendor Hall Closes Saturday AUG 15 9:30 AMVendor Hall Opens for VIP Badges Open for League & Gym Badge Holders 10:00 AMVendor Hall Opens for All Badges Voice Actor Alley Opens 11:00 AMCharacter Photo Ops 11:00 AMGroup Trivia Panel Room 12:30 PMPokmon Bingo Panel Room 1:30 PMCharacter Photo Ops 1:30 PMPokemon TCG Tournament Panel Room 2:00 PMCharacter Photo Ops 3:30 PMPokmon Bingo Panel Room 3:30 PMCharacter Photo Ops 4:00 PMTCG Trading Panel Room 4:30 PMPokmon Game Show Panel Room 5:00 PMCharacter Photo Ops 6:00 PMPokmon Go Tournament Panel Room 7:00 PMVendor Hall Closes 7:00 PMTrade Night Party Till 11pm Including Karaoke w/ Chester

As always, comments and suggestions are much appreciated