ISA Grading While there are many card grading services that focus on sports or TCG cards, ISA International Sports Card Authentication has rather good service for all kinds of cards, despite their name
There are ways to get gems without paying, but this being a free-to-play game, its a glacial rate
I prefer typical soft see-through sleeves as theyre the least damage prone, accepted by all grading companies and easiest for everyone to get cards in / out (I often sell cards at the card shop)
is a Link-2 Monster that requires 2 Effect Monsters
It can defend almost anything and also tank for your Hog Rider when you go on offense
When a cards primary function is to accelerate you, the difference between a one-cost card and a two-cost card can be a lot, and when its a creature with summoning sickness, the difference is felt even stronger