magnetic card sleeves 20-Pack One Touch Sleeved-Card Magnetic-Holders These holders offer a perfect fit for standard 25pc Magnetic Card Holder 35pt,Card

I'd grab a pen and have some paper handy to write on so that if you need to make notes about things that are harder to track because they aren't as visible ("Okay, I have his Teferi's Protection exiled with my Spelljack" or "Erin's graveyard contains three cards she can cast from the graveyard"), you have easy access to doing so

Especially if one has looked for a card for years

It can stop a Battle Phase, negate a summon, or Omni-negate any effect, all while banishing itself so that your opponent can't try to take care of it after baiting out its effect

When a card is added to the inkwell, it stays there for the rest of the game - meaning you cant use any of the text or abilities on the front of the card once its turned into ink