41 x 63 mm card sleeves Sleeve Kings Mini USA – 110 Pack, Extra Clear 60 Micron Polypropylene, Acid-Free, PVC-Free – SKS-8801 : Toys & Games Not all inserts are set up for this however Sultan Supply Premium Card Sleeves:

If this Ritual Summoned card is destroyed by battle, or is destroyed by an opponent's card effect while in its owner's Monster Zone: You can add 1 "Vendread" card from your Deck to your hand

That said, some items can break the rule

This severely limits you to just playing Alela, Artful Provocateur or Rubinia Soulsinger as your Commander

Sword of Souls Sword of Souls is a Structure Deck in the video game Yu-Gi-Oh

This allows you to constantly blink Kefka, so you can keep taking advantage of its enter the battlefield effect

Tentacool W - Sharpness 10 CC - Watering 20 Tentacruel CC - Poison Whip 30 Your opponent's Active Pokmon is now Poisoned