board game card sleeve Recommendations on "true to size" sleeves and Fluxx Sleeve Kings 60 Micron Standard

The clearest starting point is looking at these cards that have already been banned elsewhere

[1] This is one of the four Booster Packs combined into Dark Revelation Volume 3

These high-quality sleeves feature a charming design inspired by Erika, the Grass-type Gym Leader from the Kanto region

I'm shaking and my gf thinks I'm crazy. Some users cast doubt on his story, saying the posts could have been fabricated in a way to gain sympathy for an upcoming auction

Power of Chaos: Kaiba the Revenge (2004) Yu-Gi-Oh

Yes, your opponent had to spend a card and mana to do that, but if a card was printed that said "if this card is in your opening hand, you can reveal it Leyline style to force your opponent to mulligan after he/she is done resolving mulligans," it would see some play simply because of the free wins