In addition to being great places to buy from, both for sets and singles, your local stores may have Pokmon game nights or tournaments that you can take part in
Exdeath, Void Warlock / Neo Exdeath, Dimensions End Exdeath, Void Warlock has a transform condition thats pretty easy to meet, which is good because the cards power rests in Neo Exdeath, Dimension's Enda card that has my vote for Magic card that looks most like it came from Yu-Gi-Oh
I like their math the best at a glance, as 280 OHKOs many relevant Pokmon (But sadly maybe not enough?)
Why should you get your cards graded
Western collectors and Pokemon enthusiasts often seek out Japanese cards, which are both rare and highly valued
If you have a collection that you think may be worth some money, you can find out quickly what they are worth