yugioh gx legendary cards The Top 10 Yu-Gi-Oh! Sets of All Time – Cherry Collectables Yu-Gi-Oh! Legendary Products – JET

Teferi's Protection While ultimately a defensive spell, if you want to talk about cards that are quite definitionally game changing, this is one of them

Serra Angel gets reprinted every few years in the new M:TG Core sets because of how great she is

Answer to Question #3 about Unglued a

Its definitely best to pick up cards like these (ones that are difficult to get in Japanese/English/etc) while they are still around

They are both almost always good, both support most strategies directly and powerfully, and they tend to scale inversely, meaning when one is weak you will have the perfect thing to hand in the other mode