trading cards sleeves 1200 Pack Card Sleeves, Matte Dual Card with Opaque Back & Smooth Shuffle, Tear Resistant Card Protectors for MTG, TCG and Game (12 Colors) : Toys & Games looking pages available Ultra Pro: 2.5" x 3.5"

Look for any imperfections, no matter how small

Litten can be obtained from Mega Rising: Mega Gyarados pack in the Mega Rising set

Gisela is what Id affectionately call the Boros Praetor. Much like Elesh Norn, Vorinclex and their ilk, Gisela provides a magnification of an effect for you, and a nerf to the same effect for opponents

At least it's nice to be able to get this Mimikyu in cosmo foil now

Don't grade if the error is on a low-value card (grading costs more than it's worth) or you're selling to dedicated misprint collectors

or Wizards finding a way to create more reprint equity (with the most likely being to support a new Frontier-like format at some point in the future, which would increase demand for a lot of new-ish cards that aren't quite good enough to be Modern staples)