4x6 recipe card binder sleeves 50 Pockets Full Size for 8.5x11 (Pack of 25) Protectors Top-Loading Crystal Clear Recipe Card with 2 Pockets for 3 Ring Binder, Plastic Index Card Protector 100% ACID Clear 6x4 Recipe Card Holders

Literally trading it for any card you want at the time you cast it, ready to use, in your hand

Pull rate from Regular Packs: 3.11% The estimated pull rate for Marshadow (Mythical Island) from a Regular Pack is approximately 3.11%, meaning you might need to open around 33 Regular Packs to obtain it

Avoid side-loading sleeves

With two modes to try out, you're placed against your opponent in either Attrition, which turns every Boss Blind into a direct face-off, or Showdown

It is debatable which one is the next best, but I would have Diluvian Primordial as tied second with Sepulchral Primordial depending on your deck and your opponents deck, as they both rely on your opponent's graveyard